Não informado. (1931). Investigational report. U.S. Department of Commerce, Bureau of Fisheries.
Chicago-referens (17:e uppl.)Não informado. Investigational Report. Washington: U.S. Department of Commerce, Bureau of Fisheries, 1931.
MLA-referens (8:e uppl.)Não informado. Investigational Report. U.S. Department of Commerce, Bureau of Fisheries, 1931.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.