Required this textbook for a university course. While educational, the textbook is poorly edited, with mistakes such as "identify" instead of "identity" (A LOT), and talking about the detrimental effects of the gender binary only to use the term "his or her" instead of "their" in the book's definitions, which is rather hypocritical. The textbook does its job in terms of educational content, but the frequent little mistakes make this book poorly written and therefore not worth over $100. For that price, I'd expect better quality writing. Especially from a group of 'academics'. Is it that difficult to have someone read and proofread the book before it's published?