Free to read
Gilbert Strang
3 free books by Gilbert Strang.
- Calculus3rd ed. (Wellesley-Cambridge Press, 1991; hosted via MIT OCW) · 1991 · Read at ocw.mit.edu ↗
- Calculus Volume 32016 · 2016 · Read at openstax.org ↗
- Calculus, Volume 12016 · 2016 · Read at openstax.org ↗