1. Arruarte, A. (1993). Estrategias de Enseñanza de Aplicación General Asociadas al Componente Pedagógico de un ITS. Technical Report UPV/EHU/LSI/TR 793. Donostia: Universidad del Paı́s Vasco, Departamento de Lenguajes y Sistemas Informáticos.
2. Arruarte, A., Elorriaga, J.A., Fernández-Castro, I., & Ferrero, B. (1996). Knowledge reusability: some experiences in intelligent tutoring systems. In: ITS'96 Workshop on Architectures and Methods for Designing Cost-Effective and Reusable ITS's, 1996. (http://advlearn.lrdc.pitt.edu/its-arch/papers/arruarte.html)
3. Los comienzos del cálculo;Bandet,1968
4. Blumenthal, R., Meiskey, L., Dooley, S., & Sparks, R. (1996). Reducing development costs with intelligent tutoring systems shells. ITS'96 Workshop on Architectures and Methods for Designing Cost-Effective and Reusable ITS's. (http://advlearn.lrdc.pitt.edu/its-arch/papers/blumenthal.html)
5. Development tools;Davies,1996