1. Aguilar, M. S., & Puga, D. E. (2015). Mobile help seeking in mathematics: an exploratory study with Mexican engineering students. In H. Crompton & J. Traxler (Eds.), Mobile learning and mathematics. Foundations, design, and case studies (pp. 176–186). Florence, KY: Routledge.
2. Allen, I. E., & Seaman, J. (2010). Learning on demand: online education in the United States, 2009. Newburyport: The Sloan Consortium.
3. Altun, A., & Aşkar, P. (2008, 17–21 November). An ontological approach to designing learning objects. Paper presented at the E-Learn 2008, Las Vegas, NE, USA.
4. Atkins, D. E., Brown J. S., & Hammond A.L. (2007). A review of open educational resources (OER) movement: Achievements, challenges, and new opportunities. Resource document. The William and Flora Hewlett Foundation. http://www.hewlett.org/uploads/files/ReviewoftheOERMovement.pdf .
5. Attwell, G. (2007). The personal learning environments—the future of e-learning? eLearning Papers, 2(1). http://elearningeuropa.info/files/media/media11561.pdf . Accessed 7 Mar 2013.