APA (7e ed.) Bronvermelding

Abilay, W. P. (1981). Biological constraints to high yields on some rice farms in Nueva Ecija, Philippines [microform]. Photoduplication Service. University of the Philippines Library.

Chicago (17e ed.) Bronvermelding

Abilay, Wenceslao P. Biological Constraints to High Yields on Some Rice Farms in Nueva Ecija, Philippines [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1981.

MLA (9e ed.) Bronvermelding

Abilay, Wenceslao P. Biological Constraints to High Yields on Some Rice Farms in Nueva Ecija, Philippines [microform]. Photoduplication Service. University of the Philippines Library, 1981.