Kitaigorodsky, A.
Foreign Language, [Date of publication not identified]
Buku Teks SO
John D. Cutnell [and others]
John Wiley & Sons, 2015
Buku Teks SO
Klopffer, Walter
Springer, 1984
Buku Teks SO
Stevens, Malcolm P.
Oxford Univertity Press, 2009
Buku Teks SO
edited by F.A. Bovey and F.H. Winslow
Academic Press, 1979
Buku Teks