Nartea, R. N. (1977). Potassium supplying capacity of some coconut soils in the Philippines [microform]. Photoduplication Service. University of the Philippines Library.
Cita Chicago (17th ed.)Nartea, Roberto Negranza. Potassium Supplying Capacity of Some Coconut Soils in the Philippines [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
Cita MLA (9th ed.)Nartea, Roberto Negranza. Potassium Supplying Capacity of Some Coconut Soils in the Philippines [microform]. Photoduplication Service. University of the Philippines Library, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.