"Ever since Gutenberg introduced movable type in the fifteenth century, the book has been a laboratory for writers, artists, designers, and typographers. And despite the advent of digital media, print is not dead."
Steven Heller, and Veronique Vienne,"The Book," 100 Ideas that Changed Graphic Design, Laurence King, 2012. Credo Reference
A book is a series of pages assembled for easy portability and reading, as well as the composition contained in it. The book's most common form is that of a codex volume consisting of rectangular paper pages bound on one side, with a heavier cover and spine. Books have taken other forms, such as scrolls, leaves on a string, or strips tied together; and the pages have been of parchment, vellum, papyrus, bamboo slips, palm leaves, silk, wood, and other materials. The contents of books are also called books, as are other compositions of that length. For instance, The Book of Kells (an illuminated manuscript), the constituent sections of the Bible (e.g. Book of Job), even the Egyptian Book of the Dead (encoded on a scroll) are called books independently of their physical form.
"Books." International Encyclopedia of Information and Library Science, edited by John Feather and Paul Sturges, Routledge, 2003, pp. 41.