Richman, Larry
[American Management Association, ], 2002
eBooks
Christensen, Howard B.
Hoghton Mifflin, 1977
Buku Teks
Sartika Kurniali
PT Gramedia, 2009
Buku Teks
Drago, Carl
Blackwell Publishing, 2007
Buku Referensi
Kemp, Marwin K., 1942-
Academic Press, c1979
Buku Teks