Diebold, John
American Management Association, 1985
Buku Teks
McGraw-Hill, 2003
Buku Teks
O`Brien, James A., 1936-, author
McGraw-Hill/Irwin, 2004
Buku Teks
McLeod, Raymond, author
John Wiley & Sons, 1982
Buku Teks
edited by Fred Gruenberger
Prentice-Hall, 1969
Buku Teks