1. Agrawal, A.W., S. Granger-Bevan, G.L. Newark, H. Nixon, June 2015. Comparing Data Quality and Cost from Three Modes of On-Board Transit Passenger Surveys. Mineta Transportation Institute, San Jose, CA.
2. Anderson, M., October 2015. Technology Device Ownership: 2015. Pew Research Center. Retrieved from: 〈http://www.pewinternet.org/2015/10/29/technology-device-ownership-2015〉
3. Surveying for Public Transit: A Design Manual for Customer On-Board Surveys: Final Report. NCTR-416-083;Baltes,2002
4. The future of modes of data collection;Couper;Public Opin. Q.,2011
5. Cummins, B., Spitz, G., O’Malley, T.P., Campbell, M., 2013. How close is close enough? Statistical equivalence of onboard versus online surveys of transit customers. In: Paper presented at the 92nd Annual Meeting of the Transportation Research Board, Washington, D.C.