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Learning and Instruction in the Digital Age > Integrative Methods and Online Learning (Sampson) > 309-325
IEEE Transactions on Learning Technologies > 2011 > 4 > 2 > 162 - 174
IEEE Transactions on Education > 2011 > 54 > 3 > 471 - 478
IEEE Transactions on Education > 2011 > 54 > 1 > 164 - 167