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