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 SO
Soenjono Dardjowidjojo, 1938-
Rampai Bahasa, pendidikan, dan budaya: kumpulan esai
Yayasan Obor Indonesia, 2003
 Buku Teks SO
Richards, Jack C.
Approaches and methods in language teaching : a discription and analysis
Cambridge University Press, 1994
 Buku Teks