1. National Population Commission ICF International Nigeria Demographic and Health Survey 2013 Preliminary Report https://dhsprogram.com/pubs/pdf/PR41/PR41.pdf
2. World Health Organization Trends in Maternal Mortality: 1990 to 2010 WHO, UNICEF, UNFPA and The World Bank Estimates http://whqlibdoc.who.int/publications/2012/9789241503631_eng.pdf?ua=1
3. National Population Commission ICF Macro Nigeria Demographic and Health Survey 2008 http://www.unicef.org/nigeria/ng_publications_Nigeria_DHS_2008_Final_Report.pdf
4. A framework for modelling fertility motivation in couples;Miller;Popul Stud (Camb),2004
5. Absent and problematic men: demographic accounts of male reproductive roles;Greene;Popul Dev Rev,2000