Hansen, Viggo. “The History of Cartography. Vol 1: Cartography in Prehistoric, Ancient, and Medieval Europe and the Mediterranean. Ed. ByJ.B. Harley and David Woodward”. Geografisk Tidsskrift - Danish Journal of Geography 88 (January 1, 1988). Accessed December 6, 2025. https://tidsskrift.dk/geografisktidsskrift/article/view/44523.