Anderson, John R., author
N.Y. Worth, 2015
Buku Teks
Hunt, R. Reed, author
McGraw-Hill, 1999
Buku Teks
Bjorklund, David F., author
Wadsworth and Cengage Learning, 2012
Buku Teks
Bourne, Lyle E., Jr.
Prentice-Hall, 1986
Buku Teks
by Rob Ranyard [and others]; edited by Rob Ranyard, W. Ray Crozier and Ola Svenson
Routledge , 1997
Buku Teks