Del Rosario, B. P. (1980). Soil factors limiting sugar cane production in the Don Pedro Mill District, Batangas [microform]. Photoduplication Service, University of the Philippines Library.
Lua i Stíl Chicago (17ú heag.)Del Rosario, Beatriz P. Soil Factors Limiting Sugar Cane Production in the Don Pedro Mill District, Batangas [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1980.
Lua MLA (9ú heag.)Del Rosario, Beatriz P. Soil Factors Limiting Sugar Cane Production in the Don Pedro Mill District, Batangas [microform]. Photoduplication Service, University of the Philippines Library, 1980.
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