7ROWLANDS I, NICHOLAS D, HAMID R J, et al. What do faculty and students really think about e-books [ J]. Aslib Pro- ceedings: New Information Perspectives, 2007, 59 (6) : 489- 511.
9NICHOLAS D, ROWLANDS I, CLARK D, et al. UK scholarly e-book usage : a landmark survey [ J ]. Aslib Proceedings : New Information Perspectives, 2008, 60 (4) : 311-334.