Univeristy of the Philippines Diliman. National Institute for Science and Mathematics Education Development Writing Team & Carale, L. R. (2001). Practical work in elementary school science, grade 1: A sourcebook for teachers. UP NISMED.
Lua i Stíl Chicago (17ú heag.)Univeristy of the Philippines Diliman. National Institute for Science and Mathematics Education Development Writing Team agus Lourdes R. Carale. Practical Work in Elementary School Science, Grade 1: A Sourcebook for Teachers. Diliman, Quezon City: UP NISMED, 2001.
Lua MLA (9ú heag.)Univeristy of the Philippines Diliman. National Institute for Science and Mathematics Education Development Writing Team agus Lourdes R. Carale. Practical Work in Elementary School Science, Grade 1: A Sourcebook for Teachers. UP NISMED, 2001.