Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.