McConnell, Grant, author
Alfred A. Knopf, 1967
Buku Teks
Coll, Steve, 1958-, author
Penguin Books, 2012
Buku Teks
Judd, Dennis R., author
Little, Brown, 1979
Buku Teks
Patterson, Thomas E., author
McGraw-Hill, 203
Buku Teks
Ranney, Austin, author
Harcourt, Brace and Company, 1956
Buku Teks