- Google Books and Google Scholar (only a portion of the pages might be open-access but that portion may be all you need)
- Amazon's "Look inside" feature (only a portion of the pages will be open-access but that portion may be all you need)
- Open Access Button
- Unpaywall
- Note: there are many other sites that offer free items, but these are recommended because they each search a massive amount of sites/content; if you don't find something here though, you might be able to find it at another site.
