The electronic editions of books (eBooks) cannot be loaned or borrowed through Interlibrary Loan. Patrons may request a single article or chapter from an eBook, but the entire book in e-version is not loaned.
Case-study literature is a format that is not usually bought or owned by libraries, so case studies are not usually available through Interlibrary Loan. This is a format designed by for-profit companies; they provide short, single case studies (often in law, business, or medicine) that are available by subscription to a platform. Professors can select individual cases that best represent the points they wish to make in their course, for tailor-made course materials. Students usually obtain these by purchasing them individually for a nominal fee (usually a few dollars per item), or by subscription.