Griffin, B. J., Worthington, E. L., Jr., Lavelock, C. R., Greer, C. L., Lin, Y., Davis, D. E., & Hook, J. N. (2015). Efficacy of a self-forgiveness workbook: A randomized controlled trial with interpersonal offenders. Journal of Counseling Psychology, 62(2), 124–136. https://doi.org/10.1037/cou0000060