Sumber:
[1] Knowles, M. S., Holton III, E. F., & Swanson, R. A. (2015). The Adult Learner: The Definitive Classic in Adult Education and Human Resource Development. Routledge.
[2] Merriam, S. B., & Bierema, L. L. (2013). Adult Learning: Linking Theory and Practice. John Wiley & Sons.
[3] Wlodkowski, R. J., & Ginsberg, M. B. (2017). Enhancing Adult Motivation to Learn: A Comprehensive Guide for Teaching All Adults. John Wiley & Sons.
[4] Brookfield, S. D. (2013). Powerful Techniques for Teaching Adults. John Wiley & Sons.
[5] Cercone, K. (2008). Characteristics of Adult Learners with Implications for Online Learning Design. AACE Journal, 16(2), 137-159.
[6] Kasworm, C. E., Rose, A. D., & Ross-Gordon, J. M. (Eds.). (2010). Handbook of Adult and Continuing Education. SAGE Publications.
[7] Kolb, D. A. (2014). Experiential Learning: Experience as the Source of Learning and Development. FT Press.
[8] Mezirow, J. (2018). Transformative Learning Theory. In Contemporary Theories of Learning (pp. 114-128). Routledge.
[9] Sogunro, O. A. (2015). Motivating Factors for Adult Learners in Higher Education. International Journal of Higher Education, 4(1), 22-37.
[10] Pew Research Center. (2018). The Generation Gap in American Politics. Retrieved from https://www.pewresearch.org/politics/2018/03/01/the-generation-gap-in-american-politics/