University of the Philippines (Diliman). College of Education. Department of Science Teaching. (1982). Investigations of ecosystems and related activities. Department of Science Teaching, College of Education, University of the Philippines.
Citazione stile Chigago Style (17a edizione)University of the Philippines (Diliman). College of Education. Department of Science Teaching. Investigations of Ecosystems and Related Activities. Quezon City: Department of Science Teaching, College of Education, University of the Philippines, 1982.
Citatione MLA (9a ed.)University of the Philippines (Diliman). College of Education. Department of Science Teaching. Investigations of Ecosystems and Related Activities. Department of Science Teaching, College of Education, University of the Philippines, 1982.