Varberg, Purcell, Rigdon, Calculus, 9th edition, or ISU unbound edition (no graphic available).
Some professors require MyMathLab. If you bought the textbook new, you should keep the MyMathLab Student Access Kit as long as you take calculus. If you buy a used book, you may have to buy the MyMathLab Student Access Kit separately.
Instructors: be aware that the Instructor's Resource Manual, with worked-out solutions to all problems in the textbook, is freely available on the internet and is widely distributed at ISU.
Errata Supplement, updated Tue Oct 9, 2012.