Polakowski, K. J. (1987). Zoo design: The reality of wild illusions. University of Michigan, School of Natural Resources.
Chicago-referens (17:e uppl.)Polakowski, Kenneth J. Zoo Design: The Reality of Wild Illusions. [Ann Harbor]: University of Michigan, School of Natural Resources, 1987.
MLA-referens (9:e uppl.)Polakowski, Kenneth J. Zoo Design: The Reality of Wild Illusions. University of Michigan, School of Natural Resources, 1987.
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