Gorton, Richard A., author
McGraw-Hill, 2012
Buku Teks
Scheerens, Jaap, editor
Springer, 2012
eBooks
Raynor, Adrian, author
Routledge & Falmer, 2004
Buku Teks
Erlita Mutiara Maharani, author
2019
UI - Skripsi (Membership)
Koestenbaum, Peter
Jossey-Bass Publishers, 1991
Buku Teks