Almendrala, R. M. (1977). The effect of different calcium sources on the growth of mustard (brassica juncea, coss.) and some chemical properties of some Philippine soils [microform]. Photoduplication Service. University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Almendrala, Rodolfo Machado. The Effect of Different Calcium Sources on the Growth of Mustard (brassica Juncea, Coss.) and Some Chemical Properties of Some Philippine Soils [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Almendrala, Rodolfo Machado. The Effect of Different Calcium Sources on the Growth of Mustard (brassica Juncea, Coss.) and Some Chemical Properties of Some Philippine Soils [microform]. Photoduplication Service. University of the Philippines Library, 1977.