http://www.census.gov/ipc/prod/wp96/wp96005.pdf

http://www.abs.gov.au/ausstats/abs@.nsf/DetailsPage/96bcp01996?OpenDocument&tabname=Details&prodno=96bcp0&issue=1996&num=&view=&#Basic%20Community%20Profile

http://www.censusdata.abs.gov.au/ABSNavigation/prenav/ProductSelect?newproducttype=QuickStats&btnSelectProduct=View+QuickStats+%3E&collection=Census&period=2006&areacode=0&geography=&method=&productlabel=&producttype=&topic=&navmapdisplayed=true&javascript=true&breadcrumb=LP&topholder=0&leftholder=0&currentaction=201&action=401&textversion=false#Religious%20Affiliation

https://www.cia.gov/library/publications/the-world-factbook/geos/ni.html

http://www.wca-infonet.org/servlet/CDSServlet?status=ND02MzAuMTA2NTI3JjY9ZW4mMzM9ZG9jdW1lbnRzJjM3PWluZm8~

http://goliath.ecnext.com/coms2/gi_0199-3895312/ONE-SMALL-STEP-FOR-NIGERIA.html