The references below include literature reviews and meta-analyses of the effectiveness of MI.

Lundahl, B., Kunz, C., Brownell, C., Tollefson, D., & Burke, B.L. (2010). A meta-analysis of motivational interviewing: Twenty-five years of empirical studies. Research on Social Work Practice, 20(2), 137-160.

Lundahl, B., Moleni, T., Burke, B.L., Butters, R., Tollefson, D., Butler, C., & Rollnick, S. (2013). Motivational interviewing in medical care settings: A systematic review and meta-analysis of randomized controlled trials. Patient Education and Counseling, 93, 157-168.

Morton, K., Beauchamp, M., Prothero, A., Joyce, L., Saunders, L., Spencer-Bowdage, S., . . . Pedlar, C. (2015). The effectiveness of motivational interviewing for health behaviour change in primary care settings: A systematic review. Health Psychology Review, 9(2), 205-223.

Rubak, S., Sandboek, A., Lauritzen, T., & Christensen, B. (2005). Motivational interviewing: A systematic review and meta-analysis. British Journal of General Practice, 55(513), 305-312.

Soderlund, L.L., Madson, M.B., Rubak, S., & Nilsen, P. (2011). A systematic review of motivational interviewing training for general health care practitioners. Patient Education and Counseling, 84, 16-26.