Adhikari, P., R. Bhatta, B. Pradhan, N. Thapa, R. Bhandari, R. Karki, A. Shrestha, and G. Sayami. “Small Cell Carcinoma of Ethmoid Sinus”. Journal of Institute of Medicine Nepal, vol. 31, no. 3, Apr. 2010, pp. 59-60, https://www.nepjol.info/index.php/JIOM/article/view/2999.