Kim, Jong-hack
A study on the basic vocabulary in Korean language
Bok-ijoena, 2001
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Cook, Guy W.D.
Language play, language learning
Oxford University Press, 2000
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Language and language learning
edited by Albert H. Marckwardt
National Council of Teachers of English, 1968
 Buku Teks SO
Dakin, Julian
The language laboratory and language learning
Longman, 1975
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Cowan, H.K.J (Hendrik Karel Jan)
Grammar of the Sentani language ; with specimen texts and vocabulary
Martinus Nijhoff, 1965
 Buku Teks SO