APA (7e ed.) Bronvermelding

Velasco, J., & Novero, R. (1951). Studies in foliar diagnosis: I. Nitrogen relations. College of Agriculture, University of the Philippines.

Chicago (17e ed.) Bronvermelding

Velasco, J.R, en R.P Novero. Studies in Foliar Diagnosis: I. Nitrogen Relations. [Los Banos: College of Agriculture, University of the Philippines, 1951.

MLA (9e ed.) Bronvermelding

Velasco, J.R, en R.P Novero. Studies in Foliar Diagnosis: I. Nitrogen Relations. College of Agriculture, University of the Philippines, 1951.