Open Access
- Open TextBook Library
https://open.umn.edu/opentextbooks/
- Directory of Open Access Book
- Project Gutenberg
- Internet Archive Books
https://archive.org/details/books
- World Digital Library
- Open Library
- ScienceDirect Open Access
- https://booksc.org/ (Bahasa Inggris)
- https://id.booksc.org/ (Bahasa Indonesia)
- https://pustaka-digital.kemdikbud.go.id/