Rouf, M. A. ., B. . Ferdous, A. A. . Sheikh, M. Z. . Rahman, S. . Chowdhury, T. . Hasan, and A. . Moniruddin. “Umbolith: A Rare Case of Umbilical Lithiasis in Adult”. KYAMC Journal, vol. 12, no. 2, Sept. 2021, pp. 111-3, doi:10.3329/kyamcj.v12i2.55446.