Levin, Lennart
Comparative studies in foreign-language teaching
Almqvist och Wiksell, 1972
 Buku Teks SO
Teaching modern languages
edited by Ann Swarbrick
Routledge, 1994
 Buku Teks SO
Student motivation and the foreign language teacher: a guide for building the modern curriculum
edited by Frank M. Grittner
National Textbook, 1975
 Buku Teks SO
Lee, W R
Language Teaching Games and Contests
Oxford University Press, 1991
 Buku Teks SO
Lee, W. R.
Language teaching games and contests
Oxford University Press, 1991
 Buku Teks SO