Jirasiritham, Siriwan. 2018. “Can 0.15 mg. Intrathecal Morphine be as Effective as 0.2 mg in Post Cesarean Pain Control?”. Thai Journal of Anesthesiology 44 (1):12-16. https://he02.tci-thaijo.org/index.php/anesthai/article/view/116932.