Bruce W. Dearstyne, editor
Neal-Schuman Publishers, Inc., 2008
Buku Teks
Shepherd, Elizabeth, author
Facet Publishing, 2003
eBooks
Michigan State University , 2005
Buku Teks
Carmicheal, David W., author
Rowman & Littlefield , 2012
Buku Teks
Agus Umar, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2005
UI - Tesis Membership