Calculus Online Textbook

First published in 1991 by Wellesley-Cambridge Press, this updated 3rd edition of the book is a useful resource for educators and self-learners alike. It is well organized, covers single variable and multivariable calculus in depth, and is rich with applications. There is also an online Instructor’s Manual and a student Study Guide. Level: Beginner. Free course materials from MIT OpenCourseWare including lecture notes, assignments, and exams.