“…Overall, e-books were mentioned as describing content, format, book reader, and e-book reading devices. Their format refers to file or document format, e-book reader points to an application that is able to read the files on different devices, and e-book reading device indicates a portable device that is used for reading e-books (Rao, 2004), (Vasileiou, Rowley and Hartley, 2012), (Zickuhr et al, 2012); (Percy, J., 2013), (Thomson, 2014). Therefore, when we talk about e-books, it entails content, format, application, and device specifications.…”