Smucker, Bob
Jossey - Bass Publishers, 1991
Buku Teks
Kornegay, Rebecca S., author
[American Management Association, ], 2009
eBooks
Axelrod, Wendy, author
Berrett Koehler, 2011
Buku Teks
Roze, Maris, author
Houghton Miffiln, 1980
Buku Teks
Campbell, Anthony, author
Sheldon, 1992
Buku Teks