1. Worldpop—What is WorldPop? [Internet]. [cited 2016 Oct 17]. http://www.worldpop.org.uk/
2. INDEPTH Resource Kit for Demographic Surveillance Systems (Beta Version 0.9) [Internet]. [cited 2016 Feb 19]. http://www.indepth-network.org/Resource%20Kit/INDEPTH%20DSS%20Resource%20Kit/INDEPTH%20DSS%20Resource%20Kit.htm
3. form C prof dr ir WtC. Wageningen UR and AMC jointly initiate large-scale malaria study in Malawi with involvement of the local population [Internet]. Wageningen UR. 2014 [cited 2016 Mar 18]. http://www.wageningenur.nl/en/newsarticle/Wageningen-UR-and-AMC-jointly-initiate-largescale-malaria-study-in-Malawi-with-involvement-of-the-local-population.htm
4. Choosing a survey sample when data on the population are limited: a method using Global Positioning Systems and aerial and satellite photographs;HS Shannon;Emerg Themes Epidemiol,2012
5. Volunteered geographic information: future research directions motivated by critical, participatory, and feminist GIS;S Elwood;GeoJournal,2008