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Everything looks good. Just one place needs to be revised: Clark, R. & Mayer, R. E. (2008). ---> Clark, R., & Mayer, R. E. (2008). (needs a comma after Clark, R.)
Everything looks good. Just
Everything looks good. Just one place needs to be revised: Clark, R. & Mayer, R. E. (2008). ---> Clark, R., & Mayer, R. E. (2008). (needs a comma after Clark, R.)