Parkin, Alan C., author
John Wiley & Sons, 1999
Buku Teks
Adi Putra Nugraha, author
Fakultas Teknik Universitas Indonesia, 2013
UI - Skripsi (Membership)
Nenay Ika Putri, author
Fakultas Psikologi Universitas Indonesia, 2008
UI - Tesis (Open)
Elaine Biech, editor
American Management Association, 2008
eBooks
Northouse, Peter G., author
Prentice-Hall, 1985
Buku Referensi