References
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- Goodchild, M., 2007. Citizens as sensors: the world of volunteered geography. GeoJournal, 69 (4), 211–221. doi:10.1007/s10708-007-9111-y
- Haklay, M. and Weber, P., 2008. OpenStreetMap: user-generated street maps. IEEE Pervasive Computing, 7 (4), 12–18. doi:10.1109/MPRV.2008.80
- Sui, D., Elwood, S., and Goodchild, M., eds., 2012. Crowdsourcing geographic knowledge: volunteered geographic information (VGI) in theory and practice. London, UK: Springer.