1. Aguilera, A. 2008. Business travel and mobile workers. Transportation Research Part A: Policy and Practice 42: 1109–1116.
2. Anable, J., A. Darnton, K. Pangbourne, et al. 2015. Evidence base review of business travel behaviour to inform development of a segmentation of businesses. Main report, University of Aberdeen (PPRO 04/06/43). Available at https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/415569/business-travel-behaviour-main-report.pdf
3. Arnfalk, P., and B. Kogg. 2003. Service transformation—Managing a shift from business travel to virtual meetings. Journal of Cleaner Production 11: 859–872.
4. Baark, E. 1999. Engineering consultancy: An assessment of it-enabled international delivery of services. Technology Analysis & Strategic Management 11: 55–74.
5. Bryman, A. 2008. Social research methods. Oxford: Oxford University Press.