by Kenneth A. Dahlberg [and others]
Duke University Press, 1985
Buku Teks
World Bank. Global Information & Communication Technologies Department.
The World Bank, 2006
Buku Teks
McDermott, Constance, author
Earthscan, 2010
Buku Teks
edited by Michael H. Merson, Robert E. Black and Anne J. Mills
Jones & Bartlett Learning, 2012
Buku Teks
Gill, Stephen, author
John Hopkins University Press, 1988
Buku Teks