Schmuck, Richardo
Group processes in the classroom
WM. C. Brown, 1983
 Buku Teks SO
Stevick, Earl W.
Images and options in the language classroom
Cambridge Cambridge University Press 1991,
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Richards, Jill, authour
Classroom language: what sort?
George Allen and Unwin, 1979
 Buku Teks SO
Allwright, Dick
Observation in the language classroom
Longman, 1993
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Lemke, J.L. [Jay L.]
Using language in the classroom
Oxford University Press, 1989
 Buku Teks SO