edited by Cary L. Cooper, Ivan T. Robertson
John Wiley & Sons, 2000
Buku Teks
Bass, Bernard M., editor
Allyn and Bacon, 1979
Buku Teks
Auerbach, Alan J.
Brown & Benchmark, 1996
Buku Teks
Gilmer, B. von Haller (Beverly von Haller), 1909-1994
McGraw-Hill, 1966
Buku Teks
Nicolson, Paula
MacMillan Education, 1986
Buku Teks