Philippine Council for Agriculture, Forestry and Natural Resources Research and Development. Research Information Storage and Retrieval System Committee. (1989). RETRES technical abstracting manual. Philippine Council for Agriculture, Forestry and Natural Resources Research and Development.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPhilippine Council for Agriculture, Forestry and Natural Resources Research and Development. Research Information Storage and Retrieval System Committee. RETRES Technical Abstracting Manual. Los Banos, Laguna: Philippine Council for Agriculture, Forestry and Natural Resources Research and Development, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPhilippine Council for Agriculture, Forestry and Natural Resources Research and Development. Research Information Storage and Retrieval System Committee. RETRES Technical Abstracting Manual. Philippine Council for Agriculture, Forestry and Natural Resources Research and Development, 1989.