Robles, Johana; Ruiz, Fanny (5 May 2015). "Chocan trenes en Línea 5 del Metro" [Trains crash ate Metro Line 5]. El Universal (in Spanish). Archived from the original on 30 May 2021. Retrieved 30 May 2021.
Korf, Wim; Grinwis, Piet; Podt, Theo (2010). "Anticiperen op waardevol vervoer"(PDF) (in Dutch). Rapportage audit Noord/Zuidlijn. Archived from the original(PDF) on 2022-07-18. Retrieved 2022-05-02.
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Elisabeth Fischer (23 August 2011). "Justifying automation". Railway-Technology.com. Archived from the original on 12 November 2020. Retrieved 3 January 2013.
Korf, Wim; Grinwis, Piet; Podt, Theo (2010). "Anticiperen op waardevol vervoer"(PDF) (in Dutch). Rapportage audit Noord/Zuidlijn. Archived from the original(PDF) on 2022-07-18. Retrieved 2022-05-02.
Robles, Johana; Ruiz, Fanny (5 May 2015). "Chocan trenes en Línea 5 del Metro" [Trains crash ate Metro Line 5]. El Universal (in Spanish). Archived from the original on 30 May 2021. Retrieved 30 May 2021.