1. Advanced Distributed Learning, U. S. D. O. D. (2014). Training and learning architecture (TLA): Experience API (xAPI) https://github.com/adlnet/xAPI-Spec/blob/master/xAPI.md . Accessed 10 May 2016.
2. Advanced Distributed Learning, U. S. D. O. D. (2015). SCORM to TLA roadmap http://adlnet.github.io/SCORM-to-TLA-Roadmap/ . Accessed 10 May 2016.
3. Aldrich, C. (2004). Simulations and the future of learning: An innovative (and perhaps revolutionary) approach to e-learning. San Francisco, CA: Pfeiffer.
4. Arnold, K. E., & Pistilli, M. D. (2012). Course signals at purdue: Using learning analytics to increase student success. In Proceedings of the 2nd international conference on learning analytics & knowledge. New York, NY: ACM.
5. Baker, R. S., & Inventado, P. S. (2014). Educational data mining and learning analytics. In Learning analytics (pp. 61–75). New York, NY: Springer.