Aoki, K.: 2001, `Theoretical and Empirical Aspects of Gene-Culture Coevolution', Theoretical Population Biology 59, 253-261.

Baum, W.B.: 1994, Understanding Behaviorism: Science, Behavior, and Culture, Harper Collins, New York.

Blackmore, S.: 1999, The Meme Machine, Oxford University Press, Oxford.

Bickerton, D.: 1990, Language and Species, The University of Chicago Press, Chicago.

Boesch, C., 1991, `Teaching Among Wild Chimpanzees', Animal Behaviour 41, 530-532.

Boyd, R. and Richerson, P.J.: 1985, Culture and the Evolutionary Process, The University of Chicago Press, Chicago.

Boyd, R. and Richerson, P.J.: 1995, `Why Does Culture Increase Human Adaptability?', Ethology and Sociobiology 16, 125-143.

Boyd, R. and Richerson, P.J.: 1996, `Why Culture is Common but Cultural Evolution is Rare?', Proceedings of the British Academy 88, 77-93.

Calvin, W. and Bickerton, D.: 2000, Lingua ex Machina, MIT Press, Cambridge, MA.

Castro, L.: 1992, `Capacidad ética, transmisión cultural y evolución humana', Arbor 564, 81-92.

Castro, L. and Toro, M.A.: 1995, `Human Evolution and the Capacity to Categorize', Journal of Social and Evolutionary Systems 18, 55-66.

Castro, L. and Toro, M.A: 1998, `The Long and Winding Road to the Ethical Capacity', History and Philosophy of the Life Sciences 20, 77-92.

Castro, L. and Toro, M.A.: 2002, `Cultural Transmission and the Capacity to Approve or Disapprove of Offspring's Behaviour', Journal of Memetics-Evolutionary Models of Information Transmission 6 (http://jom-emit.cfpm.org/2002/vol6/castro_l&toro_ma.html).

Cheney, D.L. and Seyfarth, R.M.: 1990, How Monkeys See the World, University of Chicago Press, Chicago.

Chomsky, N.: 1972, Language and Mind, Harcourt, Brace and World, New York.

Chomsky, N.: 1988, Language and Problems of Knowledge, MIT Press, Cambridge, MA.

Deacon, T.: 1997, The Symbolic Species, Penguin Books, London.

Dunbar, R.: 1997, Grooming, Gossip, and the Evolution of Language, Harvard University Press, Cambridge, MA.

Enard, W., Przeworski, M., Fisher, S.E., Lai, C.S.L., Wiebe, V., Kitano, T., Monaco, A.P. and Pääbo, S.: 2002, `Molecular Evolution of FOXP2, a Gene Involved in Speech and Language', Nature 418, 869-872.

Feldman, M.W., Aoki, K. and Kumm, J.: 1996, `Individual versus Social Learning: Evolutionary Analysis in a Fluctuating Environment', Anthropological Science 104, 209-232.

Galef, B.G.: 1992, `The Question of Animal Culture', Human Nature 3, 157-178.

Henrich, J. and Boyd, R.: 1998, `The Evolution of Conformist Transmission and the Emergence of between Group-Differences', Evolution and Human Behavior 19, 215-241.

Inoue-Nakamura, N. and Matsuzawa, T.: 1997, `Development of Stone Tool-Use by Wild Chimpanzees (Pan Troglodytes)', Journal of Comparative Psychology 111(2), 159-173.

Kohlberg, L.: 1981, The Meaning and Measurement of Moral Development, Oelgeschlager, Gunn and Hain.

Lai, C.S.L., Fisher, S.E., Hurst, J.A., Vargha-Khadem, F. and Monaco, A.P.: 2001, `A Forkhead-Domain Gene is Mutated in a Severe Speech and Language Disorder', Nature 413, 519-523.

Laland, K.N., Richerson P.J. and Boyd, R.: 1996, `Developing a Theory of Animal Social Learning', in C.M. Heyes and B.G. Galef (eds.), Social Learning in Animals: The Roots of Culture, Academic Press, London, pp. 129-154.

Lumsden, C.J. and Wilson, E.O.: 1981, Genes, Mind, and Culture, Harvard University Press, Cambridge, MA.

Nowak, A.M. and Krakauer, D.C.: 1999, `The Evolution of Language', Proceedings of the National Academy of Sciences USA 96, 8028-8033.

Nowak, A.M., Plotkin, J.B. and Jansen, V.A.A.: 2000, `The Evolution of Syntactic Communication', Nature 404, 495-498.

Nowak, A.M., Komarova, N.L. and Niyogi, P.: 2001, `Evolution of Universal Grammar', Science 291, 114-118.

Pinker, S.: 1994, The Language Instinct, William Morrow, New York.

Pinker, S. and Bloom, P.: 1990, `Natural Language and Natural Selection', Behavioral and Brain Sciences 13, 707-784.

Premack, D.: 2004, `Is Language the Key to Human Intelligence?', Science 303, 318-320.

Premack, D. and Premack, A.: 2003, Original Intelligence, McGraw-Hill, New York.

Seyfarth, R.M. and Cheney, D.L.: 1992, `Meaning and Mind in Monkeys', Scientific American 267, 122-129.

Simon, H.: 1990, `A Mechanism for Social Selection and Successful Altruism', Science 250, 1665-1668.

Tomasello, M.: 1996, `Do Apes Ape?', in C.M. Heyes and B.G. Galef (eds.), Social Learning in Animals: The Roots of Culture, Academic Press, New York.

Tomasello, M.: 1999, The Cultural Origins of Human Cognition, Harvard University Press, Cambridge, MA.

Tomasello, M. and Call, J.: 1997, Primate Cognition, Oxford University Press, Oxford.

Tomasello, M., Kruger, A.C. and Ratner, H.H.: 1993, `Cultural Learning', Behavioral Brain Sciences 16, 495-552.

Visalberghi, E. and Fragaszy, D.M.: 1990, `Do Monkeys Ape?', in S.T. Parker and R.K. Gibson (eds.), "Language" and Intelligence in Monkeys and Apes. Comparative and Developmental Perspectives, Cambridge University Press, Cambridge, MA.

Waddington, H.C.: 1960, The Ethical Animal, Allen and Unwin, London.

Whiten, A.: 1998, `Imitation of the Sequential Structure of Actions by Chimpanzees (Pan Troglodytes)', Journal of Comparative Psychology 13, 270-281.

Zhang, J., Webb, D.M. and Podlaha, O.: 2002, `Accelerated Protein Evolution and Origins of Human-Specific Features: FOXP2 as an Example', Genetics 162, 1825-1835.