Mellgren, R. L. (1983). Animal Cogniton and Behavior. Amsterdam : North-Holland Pub..
Chicago-čujuhus (17. p.)Mellgren, Roger L. Animal Cogniton and Behavior. Amsterdam : North-Holland Pub., 1983.
MLA-čujuhus (9. p.)Mellgren, Roger L. Animal Cogniton and Behavior. Amsterdam : North-Holland Pub., 1983.
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