APA (7e ed.) Bronvermelding

Heuvelmans, B. (1959). On the track of unknown animals. Hill and Wang.

Chicago (17e ed.) Bronvermelding

Heuvelmans, Bernard. On the Track of Unknown Animals. Nueva York: Hill and Wang, 1959.

MLA (9e ed.) Bronvermelding

Heuvelmans, Bernard. On the Track of Unknown Animals. Hill and Wang, 1959.