Hughes, Richard L., author
McGraw-Hill , 2015
Buku Teks
Klenke, Karin, author
Emerald, 2015
eBooks
Duncan, Terrence D, author
Dr Terrence D.Duncan and CMSGT, 2017
Buku Teks
edited by William E. Rosenbach and Robert L. Taylor ; foreword by David P. Campbell.
Westview Press, 1984
Buku Teks
Terry, Robert W.
Jossey-Bass Publishers, 1994
Buku Teks