People writing “your” when they mean “you’re” makes you cringe. The song “The Way I Are” makes your hair stand on end. You can’t read user comments on websites anymore because you can feel brain cells dying off just trying to make sense of them. You, dear friend, are a grammar geek. As such, there are books that constitute required reading for those of your ilk. After you’re done editing this article, proceed to your nearest bookstore and purchase these must-have titles for rolling in the depths of grammar.