Nation, I.S.P., author
Cambridge University Press, 2013
Buku Teks
Kim, Jong Hack, author
Bok-ijoena, 2001
Buku Teks
Cook, Guy (Guy W. D.), author
Oxford University Press, 2000
Buku Teks
edited by Albert H. Marckwardt
National Council of Teachers of English, 1968
Buku Teks
Cowan, H.K.J (Hendrik Karel Jan), author
Martinus Nijhoff, 1965
Buku Teks