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.
Citação do estilo Chicago (17ª ed.)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.
Citação 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.