Vaux, Kenneth L
Westerview Press, 1992
Buku Teks
Gerges, Fawaz A, author
Cambridge University Press, 2005
Buku Teks
Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, 1953
Buku Teks
Allison, Penelope M.
Routledge, 1999
Buku Teks
Ody, Penelope
Dorling Kindersley, 1994
Buku Teks