Bansal, C., P. Bharti, and V. P. Singh. “Panorama of Foreign Body in Upper Digestive Tract in the Population of Uttarakhand”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 5, no. 2, Feb. 2019, pp. 416-20, doi:10.18203/issn.2454-5929.ijohns20190772.