Cita APA (7th ed.)

Perez, C. V. (1982). Readability level determination for the elementary school science textbooks. Science Education Center, University of the Philippines.

Cita Chicago (17th ed.)

Perez, Carolina V. Readability Level Determination for the Elementary School Science Textbooks. Quezon City: Science Education Center, University of the Philippines, 1982.

Cita MLA (9th ed.)

Perez, Carolina V. Readability Level Determination for the Elementary School Science Textbooks. Science Education Center, University of the Philippines, 1982.