APA (7th ed.) Citation

Gregorio, H. C., & Gregorio, C. M. (1984). Principles of elementary-secondary education. R.P. Garcia Publishing Company.

Chicago Style (17th ed.) Citation

Gregorio, Herman C., and Cornelia M. Gregorio. Principles of Elementary-secondary Education. Quezon City: R.P. Garcia Publishing Company, 1984.

MLA (9th ed.) Citation

Gregorio, Herman C., and Cornelia M. Gregorio. Principles of Elementary-secondary Education. R.P. Garcia Publishing Company, 1984.