Perkins, Donald H.
Addison-Wesley , 1987
Buku Teks SO
DiLavore, Philip
John Wiley & Sons, 1984
Buku Teks
Brun, Rene, editor
[, Springer], 2012
eBooks
Kitaigorodsky, A.
Foreign Language, [Date of publication not identified]
Buku Teks SO
John D. Cutnell [and others]
John Wiley & Sons, 2015
Buku Teks SO