"Psychologie comparée." . . "Animals Psychology." . . "Zootiere." . . "Behavior, Animal." . . "Animaux de zoo Moeurs et comportement." . . "Zirkus." . . . . "Psychologie Animaux." . . "Animaux Psychologie." . . "Tierpsychologie." . . . "The psychology and behaviour of animals in zoos and circuses"@en . "The psychology and behaviour of animals in zoos and circuses" . . . "Skizzen zu einer Tierpsychologie in Zoo und im Zirkus" . . . . . . . . . "The psychology and behaviour of animals in zoos and circuses transl. by geoffrey sircom" . . . . . . . . . . "The Psychology and behaviour of animals in zoos and circuses" . . . . . . . . "The psychology and behaviour of captive animals in zoos and circuses" . . . . . . "Studies of the psychology and behaviour of captive animals in zoos and circuses"@en . "Studies of the psychology and behaviour of captive animals in zoos and circuses" . "Psychology and behaviour of animals in zoos and circuses"@en . . . . . . . . . . . . . "Skizzen zu einer Tierpsychologie im Zoo und im Zirkus" . . . . . . . . . . . . . . . . . . "Zoologischer Garten." . . "Animaux Mœurs et comportement." . . "Animaux - Mœurs et comportement." . "Intelligence Animaux." . . "Psychology, Comparative." . . "Animaux sauvages." . .