Merritt, Davis
[American Management Association;, ], 2005
eBooks
Epstein, Edwin M.
Prentice-Hall, 1969
Buku Teks
Palmer, Barbara
Routledge, 2008
Buku Teks
Leege, David C.
Yayasan Obor Indonesia, 2006
Buku Teks
Barber, James David
Rand McNally, 1966
Buku Teks