Spangle, Michael L., author
Sage Publications, 2003
Buku Teks
Robinson, Colin
Gunung Mulia, 1993
Buku Teks
DeMarr, Beverly J., author
Pearson, 2014
Buku Teks
Harvard Business School Press, 2000
Buku Teks
Cut Malahayati, author
Restu Agung, 2006
Buku Teks