Wongtiraporn, W, S Sangkarat, S Laiwejpithaya, S Pongriyawattana, and P Chaudakshetrin. “A Comparison Study Between Oral Morphine Syrup and Morphine Intramuscular Injection in Premedication”. Siriraj Medical Journal 51, no. 2 (February 1, 1999): 86–91. Accessed May 16, 2024. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246871.