What makes the difference? A practical analysis of research on the effectiveness of distance education. Lai C, Lei J, Zhao Y. Y Zhao, J Lei, B Yan, C Lai, S Tan - Teachers College Record, 2005 - tcrecord.org GSID: 5hK8JcMoc4IJ
Visible learning: A synthesis of over 800 meta-analyses relating to achievement. [No authors listed] GSID: URs5gcOjDkkJ
E-learning and the science of instruction: Proven guidelines for consumers and designers of multimedia learning. Mayer RE. RC Clark, RE Mayer - 2016 - books.google.com GSID: lKI3ylL6EzsJ