Aryal, N., A. K. Neopane, M. Thapa, U. K. Singh, and K. Agrawal. “Crystalline Penicillin for Community Acquired Pneumonia: Does It Still Work?”. Medical Journal of Shree Birendra Hospital, vol. 11, no. 2, Apr. 2013, pp. 36-39, doi:10.3126/mjsbh.v11i2.7908.