Billington, David P., author
Basic Books, 1983
Buku Teks
Mosley, William Henry, author
Macmillan, 1984
Buku Teks
Williams, Alan, author
Kaplan Education, 2005
Buku Teks
edited by Edwin H. Gaylord, Jr., Charles N. Gaylord, James E. Stallmeyer.
McGraw-Hill, 1997
Buku Teks
Ratay, Robert T., author
McGraw-Hill, 2010
Buku Teks