1. Ally, M. (2008) Foundations of educational theory for online learning. In: Anderson, T. (Ed.). The theory and practice of online learning. Canada: Au Press, p. 15-44.
2. Amante, L. & oliveira, I. (2019). Avaliação e feedback. Desafios atuais. Lisboa; Universidade Aberta.
3. Anderson,T (2008a). Towards a theory of online learning. In: Anderson, T. (Ed.). The theory and practice of online learning. Canada: Au Press.
4. Anderson,T (2008b) Teaching in an Online Learning Context. In: Anderson, T. (Ed.). The theory and practice of online learning. Canada: Au Press.
5. Bakia, M.; Shear, L.; Toyama, Y.; Lasseter, A. (2012) Understanding the Implications of Online Learning for Educational Productivity. Washington, Department of Education, Office of Educational Technology.