National Academy of Science and Technology (Philippines). Transactions of the National Academy of Science and Technology, Republic of the Philippines 1991, volume XIII. NAST.
Chicago-referens (17:e uppl.)National Academy of Science and Technology (Philippines). Transactions of the National Academy of Science and Technology, Republic of the Philippines 1991, Volume XIII. Taguig, Metro Manila: NAST.
MLA-referens (9:e uppl.)National Academy of Science and Technology (Philippines). Transactions of the National Academy of Science and Technology, Republic of the Philippines 1991, Volume XIII. NAST.
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