1. Students' attitudes towards e‐books in a Scottish higher education institute: part 1
2. ACSFA college textbook cost study. (2006). Retrieved March, 2009, http://www.maketextbooksaffordable.org/PIRG%20response%20to%20ACSFA%20proposed%20college%20textbooks%20student%20plan%209.13.06.doc
3. Allen, N. (2008). Course correction: How digital textbooks are off track and how to set them straight (pp. 1-21). Retrieved from http://cram.whitematter.ca/images/uploads/PIRGS_Course_Correction.pdf
4. Allen, N. (2010). A cover to cover solution: How open textbooks are the path to textbook affordability. Chicago, IL: The student PIRGs (pp. 1-21). Retrieved from http://www.studentpirgs.org/uploads/66/4d/664d09ba9bc97cc9138eda5faac5e061/A-Cover-To-Cover-Solution.pdf
5. Faculty Begin to Replace Textbooks with “Freely” Accessible Online Resources