* [Guide to Discrete Mathematics](https://core.ac.uk/download/pdf/326762636.pdf) - David Gries, Fred B. Schneider (PDF)
* [How We Got from There to Here: A Story of Real Analysis](https://milneopentextbooks.org/how-we-got-from-there-to-here-a-story-of-real-analysis/) - Robert Rogers, Eugene Boman
* [How We Got from There to Here: A Story of Real Analysis](https://milneopentextbooks.org/how-we-got-from-there-to-here-a-story-of-real-analysis/) - Robert Rogers, Eugene Boman
* [Introduction to Modern Statistics](https://openintro-ims.netlify.app) - Mine Çetinkaya-Rundel, Johanna Hardin (HTML, PDF) (email address required for PDF)
* [Introduction to Modern Statistics](https://openintro-ims.netlify.app) - Mine Çetinkaya-Rundel, Johanna Hardin (HTML, PDF) (email address required for PDF)
* [Introduction to Probability](https://math.dartmouth.edu/~prob/prob/prob.pdf) - Charles M. Grinstead, J. Laurie Snell (PDF)
* [Introduction to Probability](https://math.dartmouth.edu/~prob/prob/prob.pdf) - Charles M. Grinstead, J. Laurie Snell (PDF)