Villegas, V. E. (1965). Types and breeds of farm animals, how to judge and select them. Philippine Education.
Chicago-referens (17:e uppl.)Villegas, Valente Estrada. Types and Breeds of Farm Animals, How to Judge and Select Them. Manila: Philippine Education, 1965.
MLA-referens (9:e uppl.)Villegas, Valente Estrada. Types and Breeds of Farm Animals, How to Judge and Select Them. Philippine Education, 1965.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.