V. J. Kaneria, M. M. Jariya, and H. M. Makadia. “Graceful Labeling of Arrow Graphs and Double Arrow Graphs”. Malaya Journal of Matematik 3, no. 04 (October 1, 2015): 382–386. Accessed November 22, 2024. https://www.malayajournal.org/index.php/mjm/article/view/487.