Rivers, Wilga M.
Speaking in many tongues: essays in foreign-language teaching
Cambridge University Press, 1985
 Buku Teks
Ross, Janet
Writing english : a composition text in english as a foreign language
Harper & Row , 1965
 Buku Teks
Chi, Hyon-suk
Korean speaking : easy for foreigners. Beginner, 4
Soul-si : Hangul Park, 2014
 Buku Teks
Chi, Hyon-suk
Korean speaking : easy for foreigners. Beginner, 3
Soul-si : Hangul Park, 2014
 Buku Teks
Chi, Hyon-suk
Korean speaking : easy for foreigners. Beginner, 2
Soul-si : Hangul Park, 2014
 Buku Teks