Karmena, Dendi, et al. “Perbandingan Kombinasi Tramadol Parasetamol Intravena Dengan Tramadol Ketorolak Intravena Terhadap Nilai Numeric Rating Scale Dan Kebutuhan Opioid Pascahisterektomi”. Jurnal Anestesi Perioperatif, vol. 3, no. 3, Dec. 2015, pp. 189-95, https://stable.unpadmedjournals.id/index.php/jap/article/view/612.