May, A.D., Kelly, C. and Shepherd, S.P. (2006) “The principles of integration in urban transport strategies”. Transport Policy, 13 (4). pp. 319-327. ISSN 0967-070X https://doi.org/10.1016/j.tranpol.2005.12.005
La Historia del Billete de Transporte en Madrid. 1847-2015 (2015). Consorcio Regional de Transportes de Madrid. Depósito Legal: M-16991-2015 http://www.madrid.org/bvirtual/BVCM006209.pdf
“Innovative ticketingsystems for publictransport” (2010). Policy Notes, CIVITAS Secretariat Institute for Transport Studies, University of Natural Resources and Applied Life Sciences (BOKU), Vienna
Schakenbos, R., LaPaix, L., Nijenstein, S., Geurs, K.T., (2016). “Valuationof a transfer in a multimodal publictransporttrip”. Royal Haskoning DHV, The Netherlands, Centre for Transport Studies, Faculty of Engineering Technology, University of Twente, TheNetherlands, Netherlands Railways, TheNetherlands. Transport Policy 46 (2016) 72–81 “Electric Mobility & DevelopmentAnEngagement”. Paper from the World Bank and the International Association of Public Transport. Diciembre 2018.
Ongkittikul, S., Geerlings H., (2016). “Opportunities for innovation in public transport: Effects of regulatory reforms on innovative capabilities”. Erasmus Centre of Sustainability and Management, Erasmus University Rotterdam. Transport Policy 13 (2006) 283–293
Pticina, I. (2011). “The methodology of data collection about public transport service quality”. Transport and TelecommunicationInstitute. The 11th International Conference “RELIABILITY and STATISTICS in TRANSPORTATION and COMMUNICATION -2011”
Nigel H.M. Wilson, Jinhua Zhao, Adam Rahbee. “Thepotentialimpactofautomated data collectionsystemsonurbanpublictransportplanning”. Chapter 5.
Ongkittikul, S. y Geerlings, H. (2006). Oportunidades de innovación en el transporte público: efectos de las reformas regulatorias sobre las capacidades innovadoras. Política de transporte, 13 (4), 283–293.
Czuma- Imiołczyk, L. (2019). Analysis of the use of alternative fuels in public transport in the context of sustainable management. Worldscientific News, An International ScientificJournal. News 125, 193-203.