Modern Business Report , 1985
Buku Teks
Lawson, Joseph W.R., II, author
American Management Association;;, 1998
eBooks
Pane, Omar Baginda, author
1987
UI - Skripsi Membership
Carpendale, Jeremy, author
Blackwell Publishing, 2006
Buku Teks
Lawson, Joseph W.R., II, author
American Management Association, 1998
eBooks