This is the 4th edition (includes DSM-5) of this excellent pocket-sized (but thick) reference tool for clinicians, pre-licensed therapists studying for exams, and graduate students studying psychology. The book is brilliant, really, as it has SO MUCH information in it, and is super-durable and waterproof! Why are all books not made this way?? lightly used, no real signs of wear (it would take a lot to leave marks - it is very rugged). This cost me $30 when it was new. Yours for half that (firm). If you know what this is, you know it is worth the asking price. The photos are considered an integral part of this listing. Please inspect the photos carefully, and make sure the item is in acceptable condition before purchase. Thanks for reading my listing, and if you don't buy it, please share my listing! - Matt