Science Education Center, U. o. t. P. (1973). Environmental Science 2: Pupil's guide. part 1 (Revised experimental edition.). Science Education Center, University of the Philippines.
Citace podle Chicago (17th ed.)Science Education Center, University of the Philippines. Environmental Science 2: Pupil's Guide. Part 1. Revised experimental edition. Quezon City: Science Education Center, University of the Philippines, 1973.
Citace podle MLA (9th ed.)Science Education Center, University of the Philippines. Environmental Science 2: Pupil's Guide. Part 1. Revised experimental edition. Science Education Center, University of the Philippines, 1973.
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