Não informado. (1951). Bulletin of the British Museum Natural History. British Museum of Natural History.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the British Museum Natural History. London: British Museum of Natural History, 1951.
MLA-referens (8:e uppl.)Não informado. Bulletin of the British Museum Natural History. British Museum of Natural History, 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.