1. Sampling and generalisability in developmental research: Comparison of random and convenience samples of older adults;DF Hultsch;International Journal of Behavioral Development,2002
2. Experimental and quasi-experimental designs for research;D Campbell,1966
3. Barkhuus L, Rode J (2007). From mice to men - 24 years of evaluation in CHI.
4. Roztocki, N (2001) Using internet-based surveys for academic research: Opportunities and problems. In: Proceedings of the 2001 American Society of Engineering Management (ASEM) National Conference. pp. 290–295.
5. Heer J, Bostock M (2010) Crowdsourcing graphical perception: using mechanical turk to assess visualization design. In: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. New York, NY, USA: ACM, CHI’10, pp. 203–212. URL http://doi.acm.org/10.1145/1753326.1753357.