Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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