Rivington, Jaclyn, and Michael Gillett. “Establishing a Causal Link Between Ankylosing Spondylitis and Inflammatory Bowel Disease: A Review of the Literature”. International Journal of Medical Students 4, no. 2 (August 13, 2016): 55–63. Accessed November 30, 2021. https://ijms.info/IJMS/article/view/152.