Cappello, G.; et al. (2007). "Peppermint oil (Mintoil®) in the treatment of irritable bowel syndrome: A prospective double blind placebo-controlled randomized trial". Digestive and Liver Disease 39 (6): 530–536. doi:10.1016/j.dld.2007.02.006[깨진 링크(과거 내용 찾기)]
Cappello, G.; et al. (2007). "Peppermint oil (Mintoil®) in the treatment of irritable bowel syndrome: A prospective double blind placebo-controlled randomized trial". Digestive and Liver Disease 39 (6): 530–536. doi:10.1016/j.dld.2007.02.006[깨진 링크(과거 내용 찾기)]