Two quotes from the paper:
The conceit of an e-book seems entirely appropriate and yet ‘e-book’ remains a term of which people are unsure, which is defined variously, and which is still, after some years, struggling for acceptance. Given that codices – manuscript volumes which were the prototype of the modern paper book – were in common use by the sixth century and we still have variations in understanding of the term ‘book’ in the twenty-first century, it is hardly surprising that e-book has no universally accepted definition after so few years.
So we arrive at a definition. An e-book is:Researchers using Alloway Library's catalogue and online resources have access to over 24,000 e-books and e-journals, (however you may define them!)
any content that is recognisably ‘book-like’, regardless of size, origin or composition, but excluding serial publications, made available electronically for reference or reading on any device (handheld or desk-bound) that includes a screen.