Trias Melia, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi Membership
Meisel, Perry, author
Routledge, 2007
Buku Teks
edited by Michael P. Levine
Routledge Press, 2000
Buku Teks
Jacobs, Michael, author
Sage Publications, 2003
Buku Teks
Heller, Sharon, author
ohn Wiley & Sons, 2005
Buku Teks