Use the Citation Linker to find e-journal titles and e-books that are available through e-book packages.

Hathi Trust  - allows for access to titles that are digitized and in the public domain. Make sure to log in as "Stanford University" as the partner institution.

De Gruyter e-books. Some University Press collections, namely,  Duke University Press and Columbia University Press.

Project muse . Stanford has access to some e-books of University Presses that work with Project Muse. 

X-Search is a federated search tool that includes e-book searching.