Não informado. (1936). Frontiers: A magazine of natural history. Academy of Natural Sciences of Philadelphia.
Chicago-Zitierstil (17. Ausg.)Não informado. Frontiers: A Magazine of Natural History. Philadelphia, Pa: Academy of Natural Sciences of Philadelphia, 1936.
MLA-Zitierstil (8. Ausg.)Não informado. Frontiers: A Magazine of Natural History. Academy of Natural Sciences of Philadelphia, 1936.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.