edited by David W. Ewing
Harper & Brothers, 1958
Buku Teks
Jones, Harry, 1911-
Gower Press , 1974
Buku Teks
edited by David E. Hussey
Pergamon Press, 1983
Buku Teks
Johnston, Robert E.
American Management Association, 2003
eBooks
Johnston, Robert E.
American Management Association;, 2013
eBooks