This page lists the options for purchasing a textbook and online HW system. Note: with your Mastering Physics account, you will get a copy of the etext for the 14th edition of Young and Freedman. If you are content with reading on a screen only, then the electronic version of the text is sufficient. I recommend a hard-copy text in which you can make notes in the margins; you can then keep this copy as a reference book. The textbook is University Physics, by Young and Freedman, 14th Edition, (Addison-Wesley, 2014.) You may use either volume 1 only (for PHY121 only), the full edition (for PHY121 and PHY131), or Y&F with Modern Physics (for PHY 121, 131, and 241), however your 241 instructor may choose not to use Y&F. Reading assignments are keyed to this textbook. At the bookstore, the textbook should come packaged with Mastering Physics. Mastering Physics is required. If you buy a used textbook, then you must buy Mastering Physics separately at the bookstore or online through our class Blackboard page; this is the only online place to pay for a Mastering Physics account for our class.