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2. Allen, I. E., & Seaman, J. (2013). Changing course: Ten years of tracking online education in the United States. Retrieved from http://sloanconsortium.org/publications/survey/changing_course_2012
3. Allen, I. E., & Seaman, J. (2017). Digital learning compass: Distance education enrollment report 2017. Retrieved from http://www.owicommunity.org/uploads/5/2/3/5/52350423/digtiallearningcompassenrollment2017.pdf
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5. Research based practices for improving the effectiveness of asynchronous online discussion boards.