The critical importance of retrieval for learning.
Metacognition and the spacing effect : the role of repetition , feedback , and instruction on judgments of learning for massed and spaced rehearsal
Examining engagement: analysing learner subpopulations in massive open online courses (MOOCs)
Using Spacing to Enhance Diverse Forms of Learning : Review of Recent Research and Implications for Instruction
Retrieval-Based Learning : A Perspective for Enhancing Meaningful Learning
Retrieval-Based Learning : Active Retrieval Promotes Meaningful Learning