Philippines. Department of Environment and Natural Resources, United States Agency for International Development (USAID), International Resources Group (IRG), LTD, Edgevale Associates, Silver Spring, MD., U.S.A, & Mandala Agricultural Development Corp. (MADECOR) Philippines. (1991). The Philippine natural resources accounting project (NRAP-PHASE I): Executive summary. DENR.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines. Department of Environment and Natural Resources, United States Agency for International Development (USAID), LTD International Resources Group (IRG), Silver Spring Edgevale Associates, MD., و Mandala Agricultural Development Corp. (MADECOR) Philippines. The Philippine Natural Resources Accounting Project (NRAP-PHASE I): Executive Summary. Quezon City: DENR, 1991.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines. Department of Environment and Natural Resources, et al. The Philippine Natural Resources Accounting Project (NRAP-PHASE I): Executive Summary. DENR, 1991.