(1977). Soil fertility and research: The Philippines [microform]. Photoduplication Service.
Chicago (17e ed.) BronvermeldingSoil Fertility and Research: The Philippines [microform]. Quezon City: Photoduplication Service, 1977.
MLA (9e ed.) BronvermeldingSoil Fertility and Research: The Philippines [microform]. Photoduplication Service, 1977.
Let op: Deze citaties zijn niet altijd 100% accuraat.