Allwright, Dick, author
Cambridge University Press, 1991
Buku Teks
Syarifuddin, author
Absolute Media, 2018
Buku Teks
Cambridge University Press , 1993
Buku Teks
Chastain, Kenneth
Rand McNally , 1971
Buku Teks
Christopher Titford edited
Gunter Narr, 1985
Buku Teks