United States. Bureau of Biological Survey. (1918). Review of grizzly and big brown bears of North America (genus Ursus), with description of new genus, Vetularctos. GPO.
Chicago Style (17th ed.) CitationUnited States. Bureau of Biological Survey. Review of Grizzly and Big Brown Bears of North America (genus Ursus), with Description of New Genus, Vetularctos. [Washington]: GPO, 1918.
MLA (9th ed.) CitationUnited States. Bureau of Biological Survey. Review of Grizzly and Big Brown Bears of North America (genus Ursus), with Description of New Genus, Vetularctos. GPO, 1918.
Warning: These citations may not always be 100% accurate.