1. Ashdown, B. K., & Gibbons, J. L. (2012). Faith development and collectivism among emerging adults in Guatemala and the United States. Advances in Psychology Study, 1(3), 22–28.
2. Astley, J. (1991). How faith grows (pp. 15–35). London, UK: National Society, Church House Publishing.
3. Astley, J. (2009). Insights from faith development theory and research. Projects: Passing on the Faith. Autumn. Retrieved from: http://passingonthefaith.org.uk/docs/Insights%20from%20Faith%20Development%20Theory%20and%20Research.pdf
4. Astley, J., & Francis, L. (Eds.). (1992). Christian perspectives on faith development. Leominster, UK: Grace Wing.
5. Barker, K. A. (2005). Contextual influences on faith development in adolescents and emerging adults. Master thesis, Graduate Faculty of the Louisiana State University and Agricultural and Mechanical College. Retrieved from: http://etd.lsu.edu/docs/available/etd-05312011-095723/unrestricted/Barker_Katheryn_A_Thesis_5-2011.pdf