"Empreses de transport integrat" [Integrated transport companies]. Sistema de transport (in Catalan). Metropolitan Transport Authority. Retrieved 18 July 2016.
Integrated Railway Network(PDF) (Map). Metropolitan Transport Authority. August 2013. Retrieved 26 June 2014.
"Funcionament del sistema tarifari integrat (STI)" [Usage of the Integrated Fare System (STI)]. Sistema de transport (in Catalan). Metropolitan Transport Authority. 31 May 2016. Retrieved 19 July 2016.
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