1. The Future of Libraries Part II: The End of Books;Kurzweil;Library Journal,1992
2. “Book,” Oxford English Dictionary,1989
3. See: Collaborative Program in Book History and Print Culture at the University of Toronto, http://bookhistory.ischool.utoronto.ca/;
4. Centre for the History of the Book, University of Edinburgh, http://www.hss.ed.ac.uk/chb/.