Edaigbini, S., I. Delia, M. Aminu, N. Anumenechi, and S. Audu. “Empyema Thoracis in Zaria; A Preliminary Report”. Nigerian Journal of Surgery, vol. 17, no. 2, Jan. 2012, pp. 82-86, doi:10.4103/1117-6806.90397.