Kennedy, William Jerald
West Publishing Company, 1977
Buku Teks
Lewis, Barry, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Feder, Kenneth L.
Mayfield Publishing Company, 1997
Buku Teks
Stein, Philip L., author
McGraw-Hill, 1982
Buku Teks
Nelson, Harry, author
West Publishing, 1988
Buku Teks