Não informado. (1941). Conservation bulletin of the Fish Wildlife Service, United States. U.S. Fish and Wildlife Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Conservation Bulletin of the Fish Wildlife Service, United States. Washington: U.S. Fish and Wildlife Service, 1941.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Conservation Bulletin of the Fish Wildlife Service, United States. U.S. Fish and Wildlife Service, 1941.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.