Não informado. (1941). Medical Bulletin. Standard Oil Company and Affiliated Companies.
Chicago-referens (17:e uppl.)Não informado. Medical Bulletin. New York: Standard Oil Company and Affiliated Companies, 1941.
MLA-referens (8:e uppl.)Não informado. Medical Bulletin. Standard Oil Company and Affiliated Companies, 1941.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.