1. Allen, I. E. & Seaman, J. (2010). Class differences: Online education in the United States, 2010. Babson Survey Research Group. https://www.bayviewanalytics.com/reports/class-differences.pdf
2. Allen, I. E. & Seaman, J. (2013). Changing course: Ten years of tracking online education in the United States. Babson Survey Research Group; Quahog Research Group. https://www.bayviewanalytics.com/reports/changingcourse.pdf
3. Allen, I. E., Seaman, J., Poulin, R. & Taylor, S. T. (2016). Online report card: Tracking online education in the United States. Babson Survey Research Group; Quahog Research Group. https://www.bayviewanalytics.com/reports/onlinereportcard.pdf