1. Begum, F. 2016. Mapping disease: John Snow and Cholera. https://www.rcseng.ac.uk/library-and-publications/library/blog/mapping-disease-john-snow-and-cholera/
2. Crane, N. 2004. Mercator: The man who mapped the planet. Henry Holt and Company: Owl Books.
3. Goodchild, M. F. 2018. Reimagining the history of GIS, Annals of GIS 24(1), 1–8. Publisher: Taylor & Francis _eprint: https://doi.org/10.1080/19475683.2018.1424737
4. Google Maps: 2021. https://www.google.com/maps/
5. GPS Overview: 2021. https://www.gps.gov/systems/gps/