Chaurasiya, M., M. Rupani, and S. Khunti. “Graceful Labeling of Merge Graph , Bistar Graph, Friendship Graph, Cdn Relation Graph”. International Journal of Technical Innovation in Modern Engineering & Science, vol. 6, no. 11, Oct. 2021, pp. 07-14, https://ijtimes.com/index.php/ijtimes/article/view/42.