Brady, James E., author
John Wiley & Sons, 1990
Buku Teks
Nekrasov, B., author
Peace, 1965
Buku Teks
Burman, Harold G., author
Allyn and Bacon, 1968
Buku Teks
Will, John W., author
Prentice-Hall, 2002
Buku Teks
Timberlake, Karen C., author
Pearson - Prentice Hall, 2009
Buku Teks