Artikel Jurnal
Kosso, Peter, author
Cambridge University Press, 1992
Buku Teks SO
Williams, Malcolm, 1953-, author
Routledge, 2000
Buku Teks
Suma Riella Rusdiarti, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2004
UI - Tesis Membership
Mithaug, Dennis E., author
Sage Publications, Inc., 2000
Buku Teks