• 1967. van Zon, J. C. J. & van Orshoven, J. Enkele resultaten van de Zesde Nederlandse Chimpansee-Expeditie. Vakblad voor Biologen. 47: 161-166.

• 1968. Sugiyama, Y. Social organization of chimpanzees in the Budongo Forest, Uganda. Primates. 9: 225-258.

• 1971. Albrecht, H. & Dunnett, S. C. Chimpanzees in Western Africa. Munich: R. Piper & Co.

• 1979. Sugiyama, Y. & Koman, J. Social structure and dynamics of wild chimpanzees at Bossou, Guinea. Primates. 20: 323-339.

• 1979. Sugiyama, Y. & Koman, J. Tool-using and making behavior in wild chimpanzees at Bossou, Guinea. Primates. 20: 513-524.

• 1981. Kortlandt, A., van Orshoven, J., Pfeijffers, R. & van Zon, J. C. J. Chimpanzees in the wild, Guinea 1966-1967: Sixth Netherlands chimpanzee expedition. (Transcripts of film/video texts). Amsterdam: University of Amsterdam.

• 1981. Sugiyama, Y. Observation on the population dynamics and behavior of wild chimpanzees at Bossou, Guinea, 1979-1980. Primates. 22: 435-444.

• 1984. Sugiyama, Y. Population dynamics of wild chimpanzees at Bossou, Guinea, between 1976 and 1983. Primates. 25: 391-400.

• 1986. Kortlandt, A. The use of stone tools by wild-living chimpanzees and earliest hominids. J. Hum. Evol. 15: 77-132.

• 1987. Kortlandt, A. & Holzhaus, E. New data on the use of stone tools by chimpanzees in Guinea and Liberia. Primates. 28: 473-496.

• 1987. Sugiyama, Y. & Koman, J. A preliminary list of chimpanzees' alimentation at Bossou, Guinea. Primates. 28: 133-147.

• 1988. Sugiyama, Y. Grooming interactions among adult chimpanzees at Bossou, Guinea, with special reference to social structure. Int. J. Primatol. 9: 393-407.

• 1988. Sugiyama, Y., Koman, J. & Sow, M. B. Ant-catching wands of wild chimpanzees at Bossou, Guinea. Folia primatol. 51: 56-60.

• 1989. Sugiyama, Y. Description of some characteristic behaviors and discussion on their propagation process among chimpanzees of Bossou, Guinea. pp. 43-7 IN Sugiyama, Y. (Ed.), Behavioral studies of wild chimpanzees at Bossou, Guinea. Inuyama: KUPRI.

• 1989. Sugiyama, Y. Population dynamics of chimpanzees at Bossou, Guinea. pp. 134-145 IN Heltne, P. G. & Marquardt, L. G. (Ed.), Understanding Chimpanzees. Cambridge: Harvard University Press.

• 1990. Matsuzawa, T., Sakura, O., Kimura, T., Hamada, Y. & Sugiyama, Y. Case report on the death of a wild chimpanzee (Pan troglodytes verus). Primates. 31: 635-641.

• 1991. Fushimi, T., Sakura, O., Matsuzawa, T., Ohno, H. & Sugiyama, Y. Nut-cracking behavior of wild chimpanzees ( Pan troglodytes ) in Bossou, Guinea, (West Africa). pp. 695-696 IN Ehara, A., Kimura, T., Takenaka, O. & Iwamoto, M. (Ed.), Primatology Today. Amsterdam: Elsevier.

• 1991. Matsuzawa, T. Nesting cups and metatools in chimpanzees. Beh. Brain Sci. 14: 570-571.

• 1991. Sakura, O. & Matsuzawa, T. Flexibility of wild chimpanzee nut-cracking behavior using stone hammers and anvils: an experimental analysis. Ethology. 87: 237-248.

• 1991. Sakura, O. On the concept of 'group' in primates, with special reference to fission-fusion of chimpanzees. pp. 247-250 IN Ehara, A., Kimura, T., Takenaka, O. & Iwamoto, M. (Ed.), Primatology Today. Amsterdam: Elsevier Science Publishers.

• 1991. Sakura, O., Fushimi, T., Matsuzawa, T., Ohno, H. & Sugiyama, Y. Social behavior of wild chimpanzees in Bossou, Guinea, West Africa. pp. 713-714 IN Ehara, A., Kimura, T., Takenaka, O. & Iwamoto, M. (Ed.), Primatology Today. Amsterdam: Elsevier Science Publishers.

• 1991. Sugiyama, Y. Habitat isolation and population structure of wild chimpanzees in and around Bossou, West Africa. pp. 32-35 IN Maruyama, N. & others (Ed.), Wildlife Conservation: Present Trends and Perspectives for the 21th Century. Tokyo: Japan Wildlife Research Center.

• 1992. Sugiyama, Y. & Koman, J. The flora of Bossou: its utilization by chimpanzees and humans. African Study Monographs. 13: 127-169.

• 1993. Sugiyama, Y., Fushimi, T., Sakura, O. & Matsuzawa, T. Hand preference and tool use in wild chimpanzees. Primates. 34: 151-159.

• 1993. Sugiyama, Y., Kawamoto, S., Takenaka, O., Kumazaki, K. & Miwa, N. Paternity discrimination and inter-group relationships of chimpanzees at Bossou. Primates. 34: 545-552.

• 1994. Derrick, R. Culture in a nutshell: Chimp gives lessons in learning. BBC Wildlife Magagine. 12: 10.

• 1994. Matsuzawa, T. Field experiments on use of stone tools by chimpanzees in the wild. pp. 351-370 IN Wrangham, R. W., McGrew, W. C., de Waal, F. B. M. & Heltne, P. G. (Ed.), Chimpanzee Cultures. Cambridge: Harvard University Press.

• 1994. Sakura, O. Factors affecting party size and composition of chimpanzees (Pan troglodytes verus) at Bossou, Guinea. Int. J. Primatol. 15: 167-183.

• 1994. Sugiyama, Y. Age-specific birth rate and lifetime reproductive success of chimpanzees at Bossou, Guinea. Am. J. Primatol. 32: 311-318.

• 1994. Sugiyama, Y. Research at Bossou. Pan Africa News. 1: 2-3.

• 1994. Sugiyama, Y. Tool use by wild chimpanzees. Nature. 367: 327.

• 1995. Sugiyama, Y. Drinking tools of wild chimpanzees at Bossou. Am. J. Primatol. 37: 263-269.

• 1995. Sugiyama, Y. Tool-use for catching ants by chimpanzees at Bossou and Monts Nimba, West Africa. Primates. 36: 193-205.

• 1995. Yamakoshi, G. & Sugiyama, Y. Pestle-pounding behavior of wild chimpanzees at Bossou, Guinea : A newly observed tool-using behavior. Primates. 36: 489-500.

• 1996. Matsuzawa, T. & Yamakoshi, G. Comparison of chimpanzee material culture between Bossou and Nimba. pp. 211-232 IN Russon, A., Bard, K. & Parker, S. (Ed.), Reaching into Thought: the Minds of the Great Apes. Cambridge: Cambridge University Press.

• 1996. Matsuzawa, T. Chimpanzee intelligence in nature and in captivity: Isomorphism of symbol use and tool use. pp. 196-209 IN McGrew, W. C., Marchant, L. F. & Nishida, T. (Ed.), Great Ape Societies. Cambridge: Cambridge Univ. Press.

• 1997. Inoue-Nakamura, N. & Matsuzawa, T. Development of stone tool use by wild chimpanzees (Pan troglodytes). J. Comp. Psychol. 111: 159-173.

• 1997. Matsuzawa, T. The death of an infant chimpanzees at Bossou, Guinea. Pan Africa News. 4: 4-6.

• 1998. Hirata, S., Morimura, N. & Matsuzawa, T. Green passage plan (tree-planting project) and environmental education using documentary videos at Bossou: A progress report. Pan African News. 5: 18-20.

• 1998. Hirata, S., Myowa, M. & Matsuzawa, T. Use of leaves as cushions to sit on wet ground by wild chimpanzees. Am. J. Primatol. 44: 215-220.

• 1998. Yamakoshi, G. Dietary responses to fruit scarcity of wild chimpanzees at Bossou, Guinea: Possible implications for ecological importance of tool use. Am. J. Phys. Anthropol. 106: 283-295.

• 1998. Yamakoshi, G. Dietary responses to fruit scarcity of wild chimpanzees at Bossou, Guinea: possible implications for ecological importance of tool use. Am. J. Phys. Anthropol. 106: 283-295.

• in press. Sugiyama, Y. Demographic and migration patterns of a wild chimpanzee group at Bossou, Guinea. Primates.

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