1. MaaS service combinations for different geographical areas;Aapaoja,2017
2. Rethinking transportation 2020-2030: The disruption of transportation and the collapse of the internal-combustion vehicle and oil industries;Arbib,2017
3. Observation: A complex research method;Baker;Library Trends,2006
4. Journeys of the future: Introducing mobility as a service;Burrows,2016
5. Constructing grounded theory: A practical guide through qualitative analysis (introducing qualitative methods series);Charmaz,2006