Thompson, Mark P., author
Thompson and Brian Tracy, 2011
Buku Teks
Dobson, Michael Singer, author
[American Management Association, ], 2000
eBooks
Miletsky, Jay, author
Course Technology Cengage Learning, 2010
Buku Teks
Weber, Larry, author
John Wiley & Sons Inc., 2009
Buku Teks
Brian Tracy, author
[American Management Association;, ], 2003
eBooks