Source: Chittum, J. R., Enke, K. A. E., & Finley, A. P. (2022). The effects of community-based and civic engagement in higher education. American Association of Colleges and Universities. 

Source: Valentine, J., Price, D., & Yang, H.; DVP-PRAXIS LTD (2021). High-impact practices and gains in student learning: Evidence from Georgia, Montana, and Wisconsin. Lumina Foundation.