Journal of Engineering Research, vol. 4, no. 4, page. 113 - 129, 2016-12
JOURNAL OF TESTING AND EVALUATION, vol. 43, no. 1, page. 171 - 178, 2015-01
JOURNAL OF TESTING AND EVALUATION, vol. 41, no. 4, page. 525 - 533, 2013-07
PAKISTAN JOURNAL OF STATISTICS, vol. 29, no. 2, page. 217 - 230, 2013-04