Lewis, James B.
Jones and Bartlett Publishers, 2011
Buku Teks
Reynolds, Amanda
Open universtity press , 2000
Buku Teks
edited by Saul Feldman
Charles C. Thomas, 1980
Buku Teks
Leebov, Wendy
Jossey-Bass, 1990
Buku Teks
Shortell, Stephen Michael, 1944-
John Wiley & Sons, 1983
Buku Teks