WW Norton and Company, 2002
Buku Teks
Bashir, Sajitha
The World Bank, 2009
Buku Teks
edited by F. Lance Craigead, Charles L. Convis Jr
Esri Press, 2013
Buku Teks
edited by Corinne Mulley, John D. Nelson
Emerald, 2016
eBooks
Jackson, W.A. Douglas
John Wiley & Sons, 1985
Buku Teks