Velasco, J., & Novero, R. (1951). Studies in foliar diagnosis: I. Nitrogen relations. College of Agriculture, University of the Philippines.
Citace podle Chicago (17th ed.)Velasco, J.R, a R.P Novero. Studies in Foliar Diagnosis: I. Nitrogen Relations. [Los Banos: College of Agriculture, University of the Philippines, 1951.
Citace podle MLA (9th ed.)Velasco, J.R, a R.P Novero. Studies in Foliar Diagnosis: I. Nitrogen Relations. College of Agriculture, University of the Philippines, 1951.
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