National Science and Technology Authority, Philippines. Ministry of Education and Culture, Region VIII, Divine Word University, & University of the Philippines Science Education Center. (1982). IPSED modules for Leyte-Samar region: Elementary level. Published by the UP Science Education Center for the NSTA.

National Science and Technology Authority, Region VIII Philippines. Ministry of Education and Culture, Divine Word University, and University of the Philippines Science Education Center. IPSED Modules for Leyte-Samar Region: Elementary Level. Quezon City: Published by the UP Science Education Center for the NSTA, 1982.

National Science and Technology Authority, et al. IPSED Modules for Leyte-Samar Region: Elementary Level. Published by the UP Science Education Center for the NSTA, 1982.