Barnes, Donald L.
New approaches to teaching elementary social studies
Burgess, 1969
 Buku Teks SO
Richards, Jack C.
Approaches and methods in language teaching
Cambridge University Press, 2015
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Approaches to teaching foreign languages
edited by M.G. Hesse
North-Holland, 1975
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Richards, Jack C.
Approaches and methods in language teaching
Cambridge University Press, 2006
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Moore, Kenneth D
Classroom teaching skills
McGraw--Hill, 2007
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