A. Kapuria

The past tense inflection project (PTIP): speeded past tense inflections, imageability ratings, and past tense consistency measures for 2,200 verbs

Emily R. Cohen-Shikora, D. Balota, M. Yap, 2013, Behavior research methods.

Learning Chronobiology by Improving Wikipedia

Paul G. Fahey, A. Chen, M. Wright, 2012, Journal of biological rhythms.