Gaya APA

OETAMA, H., SIHOMBING, A, T. (2019). Preoperative intravenous tramadol for percutaneous nephrostomy to reduce intraoperative pain . Surabaya: Indonesian Urological Association.

Gaya MLA

OETAMA, Harris., SIHOMBING, Aaron, Tigor. "Preoperative intravenous tramadol for percutaneous nephrostomy to reduce intraoperative pain". Surabaya: Indonesian Urological Association, 2019. Artikel.