Cambridge University Press, 2004
Buku Teks
Harvard Business School Press, 2001
Buku Teks
Mooi Standing, editor
McGraw-hill Open Univ. press , 2011
Buku Teks
Taylor, George A., author
D. Van Nostrand, 1964
Buku Teks
Seldner, Betty J.
McGraw-Hill, 1994
Buku Teks