Munn, Norman L., author
Houghton-Mifflin, 1955
Buku Teks
Powell, Russell A., 1950-, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Powell, Russell A., 1950-, author
Cengage Learning, 2017
Buku Teks
Combs, Arthur W., author
Harper & Row, Publishers., 1959
Buku Teks
Rachlin, Howard, author
W.W. Norton, 1970
Buku Teks