Aziizah Gita and A. M. Muhar, “Changes In Glutamic Oxaloacetic Transaminase Serum (SGOT) and Glutamic Pyruvic Transaminase Serum (SGPT) Value In Laparoscopic Cholecystectomy Patient at USU Hospital”, Sumat. Med. J., vol. 3, no. 2, Apr. 2019.