المراجع
وهي مرتبة حسب أهمية ورودها في المتن
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Grindley, G. C. (1950): The Intelligence of Animals. London.
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Imms, A. D. (1938): Social Behaviour in Insects. London.
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Armstrong, E. A. (1947): Bird Display and Behaviour. London.
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Fox, M. H. (1952): The Personality of Animals. London.
