Faez N. Ghaffoori, H. M. A. Abdullah, Saif Z. Hameed. “On the Direct Product of Pure 1, 2, 3 and 4 Pure Subgroups of Abelian Group G”. International Journal of Advanced Science and Technology 29, no. 7 (May 13, 2020): 1290 - 1295. Accessed May 6, 2024. http://sersc.org/journals/index.php/IJAST/article/view/15135.