APA (7th ed.) Citation

Gregorio, H. C. (1967). Principles and methods of teaching (Rev. ed.). R.P. Garcia.

Chicago Style (17th ed.) Citation

Gregorio, Herman Cruz. Principles and Methods of Teaching. Rev. ed. Quezon City: R.P. Garcia, 1967.

MLA (9th ed.) Citation

Gregorio, Herman Cruz. Principles and Methods of Teaching. Rev. ed. R.P. Garcia, 1967.