"Population Trends", Enid Market Analysis [Архівовано 3 вересня 2010 у Wayback Machine.], Prepared by University of Oklahoma Center for Business and Economic Development, Prepared for Oklahoma Housing and Finance Agency, 2002, p. 8.
web.archive.org
"Population Trends", Enid Market Analysis [Архівовано 3 вересня 2010 у Wayback Machine.], Prepared by University of Oklahoma Center for Business and Economic Development, Prepared for Oklahoma Housing and Finance Agency, 2002, p. 8.
