Não informado. (1936). Frontiers: A magazine of natural history. Academy of Natural Sciences of Philadelphia.
Chicago-viite (17. p.)Não informado. Frontiers: A Magazine of Natural History. Philadelphia, Pa: Academy of Natural Sciences of Philadelphia, 1936.
MLA-viite (8. p.)Não informado. Frontiers: A Magazine of Natural History. Academy of Natural Sciences of Philadelphia, 1936.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.