Shadick, N. A.; Sowell, N. F.; Frits, M. L.; Hoffman, S. M.; Weinblatt, M. E. (2013). "A randomized controlled trial of an Internal Family Systems-based intervention in rheumatoid arthritis: Effects on quality of life and psychological outcomes". Annals of Behavioral Medicine. 46 (3): 346–357. doi:10.3899/jrheum.121465.