Russo, Mark F., author
John Wiley & Sons, 1999
Buku Teks
Morley, Arthur, author
English Language Book Society, 1962
Buku Teks
Smith, I. McKenzie
Longman, 1990
Buku Teks
Azad, Abdul K.M.; Auer, Michael E.; Hadward, Judson, editors
IGI Global, 2012
Buku Teks
Buku Teks