Bix, Brian H.
Sweet & Maxwell, 1999
Buku Teks
Malloy, Robin Paul
Cambridge University Press, 2004
Buku Teks
Grana, Sheryl J
Prentice-Hall, 1999
Buku Teks
Purnawidhi W. Purbacaraka
Alumni, 1986
Buku Teks
Chinhengo, Austin M.
Cavendish Publishing, 1995
Buku Teks