Saran Kaur Gill, Nantana Gajaseni, editors
Universiti Kebangsaan Malaysia, 2012
Buku Teks
edited by Tham Siew Yean
Institute of South East Asia Studies, 2013
eBooks
Murray, Neil, author
Cambridge University Press, 2015
eBooks
Henry, David D
Jossey-Bass Publishers, 1975
Buku Teks
edited by Guy Neave, Frans A van Vught
Pergamon Press, 1994
Buku Teks