1. African Institute for Development Policy (AFIDEP) 2012 Drivers of progress in increasing contraceptive use in sub-Saharan Africa: Case studies from Eastern and Southern Africa http://www.afidep.org/images/downloads/drivers%20-%20research%20brief2.pdf
2. Ahmed , Ghyasuddin William P. Schellstede Nancy E. Williamson 1984 Underreporting of condom use in Bangladesh http://pdf.usaid.gov/pdf_docs/PNABC367.pdf