Michael, B. D., E. Nwagrabe, and J. A. Awolola. “The Commutative Properties of Multigroup”. Faculty of Natural and Applied Sciences Journal of Mathematical and Statistical Computing, vol. 2, no. 1, Sept. 2024, pp. 39-43, https://fnasjournals.com/index.php/FNAS-JMSC/article/view/593.