Gregorio, H. C. (1976). Principles and methods of teaching (Rev. ed.). R. P. Garcia.
Chicago Style aipamenaGregorio, Herman Cruz. Principles and Methods of Teaching. Rev. ed. Quezon City: R. P. Garcia, 1976.
MLA aipamenaGregorio, Herman Cruz. Principles and Methods of Teaching. Rev. ed. R. P. Garcia, 1976.
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