BakerR., BrickJ. M., BatesN. A., BattagliaM., CouperM. P., DeverJ. A., GileK. J., & TourangeauR. (2013) Summary report of the AAPOR task force on non-probability samplingJournal of Survey Statistics and Methodology, I, pp 99–143
2.
DoeP., & SmithR. (2013) Best of both worlds? Can we make convenience samples representative? Paper presented at the ESOMAR Congress, 22-25 September
3.
TaylorH. (2007) The case for publishing (some) online polls The Polling Report Available online at: http://www.pollingreport.com/ht_onlinehtm (accessed 18 November 2013)