Our Ironclad Guarantee
You must be satisfied. Try our print books for 30 days or our eBooks for 14 days. If they aren't the best you've ever used, you can return the books or cancel the eBooks for a prompt refund. No questions asked!
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If you're a college instructor who would like to consider a book for a course, please visit our website for instructors to learn how to get a complimentary review copy and the full set of instructional materials.