Science Education Center, U. o. t. P. (1972). Environmental science 1: Pupil's guide Part 2 (Revised experimental ed.). Science Education Center, University of the Philippines.
Citace podle Chicago (17th ed.)Science Education Center, University of the Philippines. Environmental Science 1: Pupil's Guide Part 2. Revised experimental ed. Quezon City: Science Education Center, University of the Philippines, 1972.
Citace podle MLA (9th ed.)Science Education Center, University of the Philippines. Environmental Science 1: Pupil's Guide Part 2. Revised experimental ed. Science Education Center, University of the Philippines, 1972.
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