Gregorio, H. C. (1976). Principles and methods of teaching (Rev. ed.). R. P. Garcia.
芝加哥风格引文Gregorio, Herman Cruz. Principles and Methods of Teaching. Rev. ed. Quezon City: R. P. Garcia, 1976.
MLA引文Gregorio, Herman Cruz. Principles and Methods of Teaching. Rev. ed. R. P. Garcia, 1976.
警告：这些引文格式不一定是100％准确.