Boyan, Lee, author
American Management Association, 1989
eBooks
Goldner, Paul S., author
American Management Association;, 2006
eBooks
Stone, Bob
Prentice-Hall, 1986
Buku Teks
Allen, Peter, author
Pitman, 1998
Buku Teks
Lapp, Charles L.
McGraw-Hill, 1957
Buku Teks