Hartnett, M., A. St. George, and J. Dron. “Examining Motivation in Online Distance Learning Environments: Complex, Multifaceted and Situation-Dependent”. The International Review of Research in Open and Distributed Learning, Vol. 12, no. 6, Oct. 2011, pp. 20-38, doi:10.19173/irrodl.v12i6.1030.