K. Mohammad Ali, Haibat, and Mohammad E. Dahsh. “W-Closed Submodule and Related Concepts”. Ibn AL-Haitham Journal For Pure and Applied Sciences 31, no. 2 (September 12, 2018): 164–178. Accessed April 18, 2025. https://jih.uobaghdad.edu.iq/index.php/j/article/view/1955.