Kuti, O., Faponle, A., Adeyemi, A., & Owolabi, A. (2008). Pain Relief in labour: A randomized controlled trial comparing pentazocine with Tramadol. Nepal Journal of Obstetrics and Gynaecology, 3(1), 14–18. Retrieved from https://www.nepjol.info/index.php/NJOG/article/view/1433