AL-Mothafar, Nuhad S., and Ghaleb A. Humod. “2-Regular Modules”. Ibn AL- Haitham Journal For Pure and Applied Sciences 28, no. 2 (March 19, 2017): 184–192. Accessed May 24, 2022. https://jih.uobaghdad.edu.iq/index.php/j/article/view/223.