Herring, E. Pendleton, author
Norton, 1966
Buku Teks
Bardes, Barbara A., author
Thomson/Wadsworth, 2006
Buku Teks
Robert E. Diclerico, Allan S. Hammock, editor
McGraw-Hill, 2009
Buku Teks
Hickok, Eugene W.
The Free Press, 1993
Buku Teks
Waltz, Kenneth N., author
Little, Brown, 1967
Buku Teks