Title: Elementary Calculus: An Infinitesimal Approach
Author: H. Jerome Keisler
License: Creative Commons 3.0
Why This Book?
If you are an undergraduate student and want to get started with calculus, this is the book, written for you. Author, Jerome Keisler presented everything very systematically in the book, so that it is easier to understand the calculus thing even for novice.
The book contains 14 chapters, such as differentiation, integration, vector, trigonometric function, infinite series etc. First edition of this book was written in 1976, then it was revised in 2012 and again in 2017 to keep the book up to date. The book is also available in printed edition; the author still managed to keep the electronic format free for everyone.
Some other books of importance.
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