Cole, G.D.H. (George Douglas Howard), 1889-1959, author
Knopt, 1932
Buku Teks
Cohen, Jack, author
Penguins Books, 1994
Buku Teks
Shore, Peter, author
Bernard Babani, 1995
Buku Referensi
Cotterill, Rodney, author
Cambridge University Press, 1989
Buku Referensi
O`Donnell, Sandra Martin, author
Prentice-Hall, 1994
Buku Teks