Pokhrel, K., S. Shrestha, and S. Sharma. “Congenital Maxillary Double Lip: A Case Report”. Journal of Nepalese Society of Periodontology and Oral Implantology, vol. 5, no. 1, July 2021, pp. 61-63, doi:10.3126/jnspoi.v5i1.38199.