The revolution will be hard-bound and highlighted

"The [textbook] industry charges outrageous prices for new textbooks while simultaneously doing everything it can to make older versions unusable or obsolete. There is simply no reason that a new calulus textbook should cost $157. The study of calculus, at least the type of calculus that most of us need to study in high school or undergraduate programs, has not changed significantly in decades." – Textbook Revolution.