Whitten A., Goodall J., McGrew W.C., Nishida T., Reynolds V., Suglyama Y., Tutin C.E., Wrangham R. W., Boesch C.,1999. Culture in chimpanzees // Nature. V. 399. P. 682—685.

Zajonc R.B., 1965. Social facilitation // Science. V. 149. P. 269—274.

Zentall T.R., 1996. An analysis of imitative learning in animals // Social learning in animals: the roots of culture / Eds. Heyes C.M., Galef B.G., Jr. San Diego: Academic Press. P. 221—243.

Zohar O., Terkel J., 1996. Social and environmental factors modulate the learning of pine- cone stripping techniques by black rats, Rattus rattus // Anim. Behav. 1996. V. 51. P. 611—618.