Network length including 9.5 km "express tram" section of Route 51 between Zuid Station and Westwijk. See: "Beschrijving voorkeursvariant Amstelveenlijn" [Description Preferred Version Amstelveen Line] (PDF) (به هلندی). City Region of Amsterdam. 12 March 2013. p. 12. Archived from the original(pdf) on 2 February 2015. Retrieved 2014-12-14.
"2015 Jaarverslag" [2015 Annual Report] (به هلندی). GVB Holding NV. 23 March 2016. p. 22. Archived from the original(html) on 25 June 2016. Retrieved 2016-06-15.
"2015 Jaarverslag" [2015 Annual Report] (به هلندی). GVB Holding NV. 23 March 2016. p. 22. Archived from the original(html) on 25 June 2016. Retrieved 2016-06-15.
Network length including 9.5 km "express tram" section of Route 51 between Zuid Station and Westwijk. See: "Beschrijving voorkeursvariant Amstelveenlijn" [Description Preferred Version Amstelveen Line] (PDF) (به هلندی). City Region of Amsterdam. 12 March 2013. p. 12. Archived from the original(pdf) on 2 February 2015. Retrieved 2014-12-14.