Campos, B. (1976). Socio-economic study of farmers in Kalinga-Apayao. Special Studies Division, Dept. of Agriculture.
Chicago-referens (17:e uppl.)Campos, B.T. Socio-economic Study of Farmers in Kalinga-Apayao. Quezon City: Special Studies Division, Dept. of Agriculture, 1976.
MLA-referens (9:e uppl.)Campos, B.T. Socio-economic Study of Farmers in Kalinga-Apayao. Special Studies Division, Dept. of Agriculture, 1976.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.