Integral
- Keisler, H. Jerome, Elementary Calculus: An Approach Using Infinitesimals, University of Wisconsin
- Stroyan, K.D., A Brief Introduction to Infinitesimal Calculus, University of Iowa
- Mauch, Sean, Sean's Applied Math Book, CIT, an online textbook that includes a complete introduction to calculus
- Crowell, Benjamin, Calculus, Fullerton College, an online textbook
- Garrett, Paul, Notes on First-Year Calculus
- Hussain, Faraz, Understanding Calculus, an online textbook
- Kowalk, W.P., Integration Theory, University of Oldenburg. A new concept to an old problem. Online textbook
- Sloughter, Dan, Difference Equations to Differential Equations, an introduction to calculus
- Wikibook of Calculus
- Numerical Methods of Integration at Holistic Numerical Methods Institute
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