Food and Agriculture Organization of the United NAtions, Philippines. Bureau of Soils, UNDP/FAO/PHI-IO Soil Fertility Survey and Research Project, & United NAtions Development Program in the Philippines. (1972). Soil survey and land classification of the Penaranda River Irrigation System Area. UNDP/FAO.
Chicago-viite (17. p.)Food and Agriculture Organization of the United NAtions, Philippines. Bureau of Soils, UNDP/FAO/PHI-IO Soil Fertility Survey and Research Project, ja United NAtions Development Program in the Philippines. Soil Survey and Land Classification of the Penaranda River Irrigation System Area. Manila: UNDP/FAO, 1972.
MLA-viite (9. p.)Food and Agriculture Organization of the United NAtions, et al. Soil Survey and Land Classification of the Penaranda River Irrigation System Area. UNDP/FAO, 1972.