Harvard Business Scholl Press, 2000
Buku Teks
Harvard Business School Press, 2003
Buku Teks
Harvard Business School Press, 1999
Buku Teks
Rochrlich, Chester, author
M. Bender, 1958
Buku Teks
edited by Edward C. Bursk and Dan H. Fenn
McGraw-Hill , 1956
Buku Teks