“It used to be that a book was published, and that was it. Permanent, physical, tangible, it could be referred to for as long as the copy survived. That’s not the case any more. We live in a world where page numbers – if they exist at all – don’t correlate from device to device, where digital text can be updated at the touch of a button, where the ebooks we own can vanish without our say-so. It’s something which is becoming a real issue, particularly for academics.”