I rented this text previously through my university and used it for a class. This text was easy to read and apply. After my class was over I returned the text to the bookstore. To rent it was $50.00 and buy it was over $130.00, so it worked best for me at the time. However, I took additional classes and through my clinicals thought how helpful this text would be for reference. So when I saw it used on Amazon for $10.00, I jumped to purchase it. I know there is a new edition of this but I am familiar with this edition. I did look through the new edition and it has similar content just presented differently.