Manuel, C. G. (1938). Food of some birds about rice fields in the Philippines. Bureau of Print.
Chicago-referens (17:e uppl.)Manuel, Canuto Guevarra. Food of Some Birds About Rice Fields in the Philippines. Manila: Bureau of Print, 1938.
MLA-referens (9:e uppl.)Manuel, Canuto Guevarra. Food of Some Birds About Rice Fields in the Philippines. Bureau of Print, 1938.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.