Coppen, H. E. (1969). Aids to teaching and learning ([1st ed.].). Pergamon Press.
Chicago Style (17. basım) AtıfCoppen, Helen Elizabeth. Aids to Teaching and Learning. [1st ed.]. Oxford, New York: Pergamon Press, 1969.
MLA (8th ed.) AtıfCoppen, Helen Elizabeth. Aids to Teaching and Learning. [1st ed.]. Pergamon Press, 1969.
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