1. Ahrens, G.A., R. Wittwer, S. Hubrich, S. Wittig, and F. Ließke. 2015. Sonderauswertung zum Forschungsprojekt “Mobilität in Städten - SrV 2013” Stadtgruppe: SrV Städtepegel [Special analysis on research project “Mobility in cities – SrV 2013. City levels]. Technische Universität Dresden, Institut für Verkehrsplanung und Straßenverkehr, Dresden. Accessed February 23, 2018. https://tu-dresden.de/bu/verkehr/ivs/srv/ressourcen/dateien/2013/uebersichtsseite/SrV2013_Stadtgruppe_SrV-Staedtepegel.pdf?lang=de
2. Ahrens, G.A., R. Wittwer, S. Hubrich, S. Wittig, and F. Ließke. 2016. Sonderauswertung zum Forschungsprojekt “Mobilität in Städten - SrV 2013”. Städtevergleich [Special analysis on research project “Mobility in cities – SrV 2013. City comparison]. Technische Universität Dresden, Institut für Verkehrsplanung und Straßenverkehr, Dresden. Accessed March 31, 2017. https://tu-dresden.de/bu/verkehr/ivs/srv/ressourcen/dateien/2013/uebersichtsseite/SrV2013_Staedtevergleich.pdf?lang=de
3. American Association of State Highway and Transportation Officials (AASHTO). 2015a. Commuting in America 2013. The national report on commuting patterns and trends. Brief 2. The role of commuting in overall travel. American Association of State Highway and Transportation Officials. Accessed December 22, 2020. https://traveltrends-dev.transportation.org/wp-content/uploads/sites/62/2019/07/B2_CIA_Role-Overall-Travel_web_2.pdf
4. American Association of State Highway and Transportation Officials (AASHTO). 2015b. Commuting in America 2013. The national report on commuting patterns and trends. Brief 5. The nature and pattern of jobs. American Association of State Highway and Transportation Officials. Accessed December 22, 2020. https://traveltrends-dev.transportation.org/wp-content/uploads/sites/62/2019/07/B5_Nature-and-Pattern-of-Jobs_CA4_web.pdf
5. American Association of State Highway and Transportation Officials (AASHTO). 2015c. Commuting in America 2013. The national report on commuting patterns and trends. Brief 15. Commuting flow patterns. American Association of State Highway and Transportation Officials. Accessed December 22, 2020. https://traveltrends-dev.transportation.org/wp-content/uploads/sites/62/2019/07/B15_Commuting-Flow-Patterns_CA15-4_web.pdf