1. Advisory Committee on Student Financial Assistance . 2007 . Turn the page: Making college textbooks more affordable . Advisory Committee on Student Financial Assistance (ACSFA). Retrieved from http://www2.ed.gov/about/bdscomm/list/acsfa/turnthepage.pdf
2. Allen , N. 2008 . Course correction: How digital textbooks are off track and how to set them straight . American Student PIRGs . Retrieved from http://cram.whitematter.ca/images/uploads/PIRGS_Course_Correction.pdf
3. Use of e‐books in an academic and research environment
4. The use of hyper-reference and conventional dictionaries
5. Boyd , D. R. (n.d.) . Using textbooks effectively: Getting students to read them . Association for Psychological Science . Retrieved from www.psychologicalscience.org/teaching/tips/tips_0603.html .