Ó Searcóid, Mícheál (2006), "2.7 Distances from Sets to Sets", Metric Spaces, Springer Undergraduate Mathematics Series, Springer, pp. 29–30, ISBN978-1-84628-627-8
Mielke, Paul W.; Berry, Kenneth J. (2000), "Euclidean distance based permutation methods in atmospheric science", in Brown, Timothy J.; Mielke, Paul W. Jr. (eds.), Statistical Mining and Data Visualization in Atmospheric Sciences, Springer, pp. 7–27, doi:10.1007/978-1-4757-6581-6_2
Klamroth, Kathrin (2002), "Section 1.1: Norms and Metrics", Single-Facility Location Problems with Barriers, Springer Series in Operations Research, Springer, pp. 4–6, doi:10.1007/0-387-22707-5_1
Høyrup, Jens (2018), "Mesopotamian mathematics"(PDF), in Jones, Alexander; Taub, Liba (eds.), The Cambridge History of Science, Volume 1: Ancient Science, Cambridge University Press, pp. 58–72, archived from the original(PDF) on May 17, 2021, retrieved October 21, 2020
Høyrup, Jens (2018), "Mesopotamian mathematics"(PDF), in Jones, Alexander; Taub, Liba (eds.), The Cambridge History of Science, Volume 1: Ancient Science, Cambridge University Press, pp. 58–72, archived from the original(PDF) on May 17, 2021, retrieved October 21, 2020