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