Aitchison, Jim
Prentice-Hall, 1999
Buku Teks
Aitchison, Jim
Prentice-Hall, 2003
Buku Teks
Rosenblun, Michsel
McGraw-Hill, 2013
Buku Teks
Trident Press, [Date of publication not identified]
Buku Referensi
Gilpin, Alan
Cambridge University Press, 1996
Buku Teks