Munjal, M., A. Kaur, G. S. Bajwa, H. Vohra, A. Sohi, and S. Munjal. “Dacrocystography: A Pre Requisite to Endoscopic Dacrocystorhinostomy”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 6, no. 4, Mar. 2020, pp. 661-3, doi:10.18203/issn.2454-5929.ijohns20201278.