Rickertsen, Rick, author
American Management Association, 2006
eBooks
Tracy, Brian, author
American Management Association, 2002
eBooks
Tracy, Brian, author
John Wiley & Sons, 2003
Buku Teks
Juliano, Joseph, author
John Wiley & Sons, 1998
Buku Teks
Naisbitt, John, author
Pan Books, 1990
Buku Teks