Barnes, Donald L.
New approaches to teaching elementary social studies
Burgess, 1969
 Buku Teks
Richards, Jack C.
Approaches and methods in language teaching
Cambridge University Press, 2015
 Buku Teks
Richards, Jack C.
Approaches and methods in language teaching
Cambridge University Press, 2006
 Buku Teks
Richards, Jack C.
Approaches and methods in language teaching
Cambridge University Press, 1994
 Buku Teks
Approaches to teaching foreign languages
edited by M.G. Hesse
North-Holland, 1975
 Buku Teks