Hotton, Geoffrey
Tavistock Publications in association with Bath University Press, 1972
Buku Teks
Pfifner, John M., author
Prentice-Hall, 1960
Buku Teks
Litterer, Joseph August, 1926-, author
John Wiley & Sons, 1973
Buku Teks
Kast, Fremont Ellsworth, author
Science Research Association, 1973
Buku Teks
edited by Jay M. Shafritz, J. Steven Ott
Wadsworth, 2005
Buku Teks