Lim, Hwanggyu, and Craig S. Wells. “[RETRACTED ARTICLE] Irtplay: An R Package for Unidimensional Item Response Theory Modeling”. Journal of Statistical Software 103, no. 12 (August 16, 2022): 1–42. Accessed May 7, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v103i12.