Artikel Jurnal
Taylor, James, author
[American Management Association, American Management Association], 2004
eBooks
Casady, Mona J. author
South-Western Publishing, 1985
Buku Teks
Rosenfeld, Louis, author
O'Reilly, 2002
Buku Teks
Rosenfeld, Louis, author
O'Reilly Published, 1998
Buku Teks