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Clement, T. S., Feltus, J. R., Kaiser, D. H., & Zentall, T. R. (2000). “Work ethic” in pigeons: reward value is directly related to the effort or time required to obtain the reward. Psychon Bull Rev, 7(1), 100–106.
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Wasilewski A. (2003). 'Friendship' in ungulates? – Sociopositive relationships between non-related herd members of the same species. Ph.D. thesis, University of Marburg, Marburg.
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Tschudin, A. J. - P. C. (2001). 'Mindreading' Mammals? Attribution of Belief Tasks with Dolphins. Anim Welfare, 10, 119–127.
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Nakagawa, S., & Waas, J. R. (2004). 'O sibling, where art thou?' – A review of avian sibling recognition with respect to the mammalian literature. Biological Reviews of the Cambridge Philosophical Society, 79(1), 101–119.
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Byrne R.W. (2000). - Animal Cognition in Nature, edited by Russell P. Balda, Irene M. Pepperberg and Alan C. Kamil. Trends. Cognit. Sci., 4, 73.
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Cords, M. (1990). 13th Cong. Int. Primat Soc.
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Heptner Vg,. (1966). 2. Wildpferd, Tarpan Equus (Equus przewalski Poljakov 1881) In: Die Säugetiere der Sowjetunion. In In: Heptner V G & Naumov N P (ed.) Jena (pp. 858–874).
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Rashek Va,. (1964). 24 hours regime of the onager and ist behviour in Barsa – Kelmes Island Aralsee.
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Bubenik Ab,. (1961). 24-Stunden Rythmus des Przewalski-Pferdes E. przewalskii während der Laktation und beginnender Brunst. Equus, 1, 122–140.
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Edwards, D. H., & Spitzer, N. (2006). 6. Social dominance and serotonin receptor genes in crayfish. Curr Top Dev Biol, 74, 177–199.
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