Gloria, R. T. (1977). Comparative performance of three grain sorghum (Sorghum bicolor L. Moench) cultivars grown under rubber and in the open field as affected by nitrogen level and plant density [microform]. Photoduplication Service, University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gloria, Ricardo Tumanda. Comparative Performance of Three Grain Sorghum (Sorghum Bicolor L. Moench) Cultivars Grown Under Rubber and in the Open Field as Affected by Nitrogen Level and Plant Density [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1977.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Gloria, Ricardo Tumanda. Comparative Performance of Three Grain Sorghum (Sorghum Bicolor L. Moench) Cultivars Grown Under Rubber and in the Open Field as Affected by Nitrogen Level and Plant Density [microform]. Photoduplication Service, University of the Philippines Library, 1977.