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UITP. (September 12, 2018). Cities with the longest metro networks in 2017 (in kilometers) [Graph]. In Statista. Retrieved April 18, 2021, from https://www.statista.com/statistics/555882/longest-metro-networks-worldwide/
UITP. "Cities with the longest metro networks in 2017 (in kilometers)." Chart. September 12, 2018. Statista. Accessed April 18, 2021. https://www.statista.com/statistics/555882/longest-metro-networks-worldwide/
UITP. (2018). Cities with the longest metro networks in 2017 (in kilometers). Statista. Statista Inc.. Accessed: April 18, 2021. https://www.statista.com/statistics/555882/longest-metro-networks-worldwide/
UITP. "Cities with The Longest Metro Networks in 2017 (in Kilometers)." Statista, Statista Inc., 12 Sep 2018, https://www.statista.com/statistics/555882/longest-metro-networks-worldwide/
UITP, Cities with the longest metro networks in 2017 (in kilometers) Statista, https://www.statista.com/statistics/555882/longest-metro-networks-worldwide/ (last visited April 18, 2021)
