APA (7e ed.) Bronvermelding

Gregorio, H. C. (1976). Principles and methods of teaching (Revised ed.). Garotech Pub.

Chicago (17e ed.) Bronvermelding

Gregorio, Herman C. Principles and Methods of Teaching. Revised ed. Quezon City: Garotech Pub, 1976.

MLA (9e ed.) Bronvermelding

Gregorio, Herman C. Principles and Methods of Teaching. Revised ed. Garotech Pub, 1976.