1. Sottilare R, Brawner K (2018) Exploring standardization opportunities by examining interaction between common adaptive instructional system components. In: Proceedings of the first adaptive instructional systems (AIS) standards workshop. US Army Research Laboratory, Orlando, Florida
2. Sottilare RA, Brawner KW, Goldberg BS, Holden HK The generalized intelligent framework for tutoring (GIFT). Concept paper released as part of GIFT software documentation. US Army Research Laboratory – Human Research & Engineering Directorate (ARL-HRED), Orlando, FL.
https://gifttutoring.org/attachments/152/GIFTDescription_0.pdf
3. Baker RS, Corbett AT, Koedinger KR, Wagner AZ (2004) Off-task behavior in the cognitive tutor classroom: when students game the system. In: Proceedings of the SIGCHI conference on Human factors in computing systems. ACM, pp 383–390
4. Vygotsky L (1987) Zone of proximal development. In: Mind in society: the development of higher psychological processes, vol 5291, p 157
5. Graham L (1998) Principles of interactive design, 1st edn. Delmar Cengage Learning, Boston, p 240. ISBN 0827385579