Harvard Business School Press, 2004
Buku Teks
Jie Lu, Lakhmi C. Jain, Guangquan Zhang, editor
[, Springer-Verlag], 2012
eBooks
Kahane, Adam
Berrett-Koehler Publishers, 2012
Buku Teks
Steele, Fritz
University of Massachusetts, 1975
Buku Teks
Ari Harsono, examiner
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2008
Artikel Jurnal