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2. Arbeit , C. A. , Horn , L. 2017 https://nces.ed.gov/pubs2017/2017416.pdf
3. Bell , S 2012 http://lj.libraryjournal.com/2012/03/opinion/nontraditional-students-are-the-new-majority-from-the-bell-tower/#_
4. Berling , V. 2013 https://evolllution.com/opinions/critical-adult-students/
5. Bidwell , A. 2014 https://www.usnews.com/news/articles/2014/06/24/higher-education-needs-to-give-older-working-students-more-opportunities