References
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- Holmes Rolston III (1994). Conserving Natural Value. New York: Columbia University Press
- Immelmano K. & Beer C. (1989). A Dictionary of Ethology. Cambridge, Mass.: Harvard University Press.
- Lorenz K. (1963). On aggression. New York: Helen and Kurt Wolff Book—Harcourt Brace Jovanovich.
- Lorenz K. (1977). Behind the Mirror. New York-London: Helen and Kurt Wolff Book—Harcourt Brace Jovanovich.
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- Lorenz K. (1987). The waning of Humaneness. Boston: Little Brown & Co.
- Searle J. (1969). Speach Acts. Cambridge University Press.