DiTrapani J, Rockwood N, Jeon M. Explanatory IRT analysis using the SPIRT macro in SPSS. TQMP. 2018;14(2):81-98. doi: 10.20982/tqmp.14.2.p081
Chintakayala PK, Young CW. Using big data to understand consumer behaviour on ethical issues. JCE. 2017 Apr 10.