Curriculum Development Center for Science and Mathematics, S. E. C. (1977). Elementary school mathematics 1: Learning math. Curriculum Development Center for Science and Mathematics, Science Education Center, University of the Philippines.
Cita Chicago (17th ed.)Curriculum Development Center for Science and Mathematics, Science Education Center. Elementary School Mathematics 1: Learning Math. Quezon City: Curriculum Development Center for Science and Mathematics, Science Education Center, University of the Philippines, 1977.
Cita MLA (9th ed.)Curriculum Development Center for Science and Mathematics, Science Education Center. Elementary School Mathematics 1: Learning Math. Curriculum Development Center for Science and Mathematics, Science Education Center, University of the Philippines, 1977.