Milkovich, George T., author
Tex Business Publications , 1985
Buku Teks
Hinrichs, John R., author
American Management Association, 1966
Buku Teks
edited by Wendell L. French and Don Hellriegel
Houghton Mifflin, 1971
Buku Teks
Nigro, Felix A., author
Holt, Rinehart and Winston , 1959
Buku Teks
Irwin, 1989
Buku Teks