M. Yeheyis, B. Reza, K. Hewage, J. Y. Ruwanpura, and R. Sadiq, “Evaluating motivation of construction workers: a comparison of fuzzy rule-based model with the traditional expectancy theory”, JCEM, vol. 22, no. 7, pp. 862–873, Jul. 2016, doi: 10.3846/13923730.2014.914103.