N.Y. AMA , 1982
Buku Teks
Henson, Ray D.
St. Paul Minn, 1979
Buku Teks
Crilly, William M.
American Management Association;, 2010
eBooks
edited by Claire A. Hill, James L. Krusemark
UK Edward Elgar Publishing, 2016
Buku Teks
Tomain, Joseph P.
West Publishing Company, 1981
Buku Teks