1. Adler, M., & Ziglio, E. (1996). Gazing into the oracle: The Delphi method and its application to social policy and public health. London: Jessica Kingsley Publishers.
2. Agonacs, N. & Matos, J. F. (2017). Towards a Heutagogy-based MOOC design framework. Proceedings of EMOOCs 2017: Work in Progress Papers of the Experience and Research Tracks and Position Papers of the Policy Track, 47-52.
3. Ally, M., & Prieto-Blázquez, J. (2014). What is the future of mobile learning in education? International Journal of Educational Technology in Higher Education, 11(1), 142–151.
4. Azizah, & Chan. (2009). Design and development of multimedia educational sexuality course. Malaysia Education Journal, 34(2), 125–142.
5. Blaschke, L. M. (2012). Heutagogy and lifelong learning: A review of heutagogical practice and self-determined learning. International Review of Research in Open and Distance Learning, 13(1), 56–71.