Palis, R. G. (1980). Soil erosion under different cover crops [microform]. Photoduplication Service. University of the Philippines Library.
Cita Chicago (17th ed.)Palis, Reynaldo Gibas. Soil Erosion Under Different Cover Crops [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1980.
Cita MLA (9th ed.)Palis, Reynaldo Gibas. Soil Erosion Under Different Cover Crops [microform]. Photoduplication Service. University of the Philippines Library, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.