(1991). Philippine technical information sheets, no.8: Forestry and natural resources. Abstracting and Indexing Division, Science and Technology Information Institute, Department of Science and Technology.
Chicago-referens (17:e uppl.)Philippine Technical Information Sheets, No.8: Forestry and Natural Resources. Bicutan, Taguig: Abstracting and Indexing Division, Science and Technology Information Institute, Department of Science and Technology, 1991.
MLA-referens (9:e uppl.)Philippine Technical Information Sheets, No.8: Forestry and Natural Resources. Abstracting and Indexing Division, Science and Technology Information Institute, Department of Science and Technology, 1991.
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