found: Work cat: 2015003773: Railean, E. Psychological and pedagogical considerations in digital textbook use and development, 2015.
found: Railean, E. (2012). Issues and challenges associated with the design of electronic textbooks. In: B.H. Khan (Ed.), User Interface Design for Virtual Environments: Challenges and Advances (pp. 238- 256). Hershey, PA: IGI Publishing.
found: Educause www homepage, March 16, 2015(E-textbooks; With the cost of textbooks soaring, many colleges and universities are looking to alternatives to the traditional paper text. The electronic textbook field is still emerging, and higher education is experimenting with the concept in various modes.)