Andrew J. Milson
Springer, 2012
eBooks
edited by Douglas McConatha, Christian Penny, Jordan Schugar, and David Bolton
Igi Global, 2014
Buku Teks
United Nations, 2004
Buku Teks
Artikel Jurnal
edited by Alma Harris and Janet H. Chrispeels
Routledge, 2006
Buku Teks