Não informado. (1936). Frontiers: A magazine of natural history. Academy of Natural Sciences of Philadelphia.
Chicago (17e ed.) BronvermeldingNão informado. Frontiers: A Magazine of Natural History. Philadelphia, Pa: Academy of Natural Sciences of Philadelphia, 1936.
MLA (8e ed.) BronvermeldingNão informado. Frontiers: A Magazine of Natural History. Academy of Natural Sciences of Philadelphia, 1936.
Let op: Deze citaties zijn niet altijd 100% accuraat.