Not every book can be an ebook
It is a sad fact universally acknowledged that unfortunately, not every print book in our collections or out there in the world is actually available as an ebook! So what can you do to source a digital copy of an essential book, when the library print collections are not accessible due to Lockdown rules?
Firstly, double check on DiscoverEd for the title you need. You can filter your search results by “online resource”.
Then consider whether the Scan & Deliver service could be useful, if you just need one chapter.
Consider using the Inter Library Loan service to get digitised journal articles or book chapters.
If you need a complete book, consider whether you can purchase a cheap second hand copy, eg using abebooks or another out of print book seller.
You could also try the various online archives of (usually out of print) books. Here is a list, in no particular order:
5: Directory of Open Access Books (DOAB)
8: Directory of Open Access Journals (DOAJ)
For more information about open access educational resources and advice, take a look at the University of Edinburgh Open.Ed resource.
If you are feeling very stuck please do contact your Academic Support Librarian for help.