Heuvelmans, B. (1959). On the track of unknown animals. Hill and Wang.
Chicago-čujuhus (17. p.)Heuvelmans, Bernard. On the Track of Unknown Animals. Nueva York: Hill and Wang, 1959.
MLA-čujuhus (9. p.)Heuvelmans, Bernard. On the Track of Unknown Animals. Hill and Wang, 1959.
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