Demilow, T.L., Ngowi, B.N., Mbwambo, J.S., Bright, F., Kiwango, F., Mteta, A.K. and Mbwambo, O.J. 2021. Pen cap in the urinary bladder: A rare type foreign body in the urinary bladder in a 16 years old female. GSC Advanced Research and Reviews. 6, 3 (Mar. 2021), 175–180. DOI:https://doi.org/10.30574/gscarr.2021.6.3.0057.