M. Regees, L. Merrit Anisha, and T. Nicholas. “Edge Magic and Bimagic Harmonious Labeling of Ladder Graphs”. Malaya Journal of Matematik 8, no. 01 (January 1, 2020): 206–215. Accessed July 16, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1375.