editors, Marshall Goldsmith, Howard Morgan, Alexander J. Ogg
John Wiley & Sons, 2004
Buku Teks
Artikel Jurnal
Dewangga Wisnu
Fakultas Ilmu Komputer Universitas Indonesia, 2013
UI - Skripsi Membership
McElroy, Mark W.
Butterworth-Heinemann, 2003
Buku Teks
Schwartz, David G.
Idea Group Reference, 2006
Buku Teks