Segerstrom, S., Stanton, A., Alden, L., & Shortridge, B. (2003). A multidimensional structure for repetitive thought: what’s on your mind, and how, and how much? Journal of Personality and Social Psychology, 85(5), 909-21. https://doi.org/10.1037/0022-3514.85.5.909

Segerstrom, S., Hardy, J., Evans, D., Boggero, I., Alden, L., & Stanton, A. (2016). Briefly Assessing Repetitive Thought Dimensions: Valence, Purpose, and Total. Assessment, 23(5), 614-23. https://doi.org/10.1177/1073191115586458