Payne, Stanley Le Baron, author
Princeton University Press, 1951
Buku Teks
Runciman, Lex, author
Allyn and Bacon, 1999
Buku Teks
Keyton, Joann, author
Mc Graw Hill, 2015
Buku Teks
Browne, M. Neil, author
Prentice-Hall, 2001
Buku Teks
Kleiman, Carol, author
Lippincott & Crowell, 1980
Buku Teks