Não informado. (1918). Bulletin of the Biological Society of Washington. Biological Society of Washington.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Biological Society of Washington. Washington: Biological Society of Washington, 1918.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Biological Society of Washington. Biological Society of Washington, 1918.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.