The previous posters are generally right, so I ordinarily wouldn't post. I have a few thoughts, though.
First: You ask for books. Really, the only book you need to buy is Strunk and White's _Elements_of_Style_. It answers nearly every question regarding style and grammar and such. As previous posters have said, you are a good writer. There is no grievous sin you've committed.
The other criticism is something you can't really learn from a book and which no one here can really teach you: the strong and properly-worded thesis. In this particular case, your thesis suffers from not really making a claim. A thesis should articulate a specific claim very lucidly. You should say exactly why her evidence fails or why feminists are wrong or something of that sort. A thesis needs to be strong and positive, whereas yours is fairly meek. If it is not, then why should I read your paper? It would add very little, would it not? A thesis needs to make a strong claim because that will compel a reader to delve further into the essay (e.g. The reader thinks "What do you mean George Washington murdered camels?! That's outrageous!")
Finding that strong claim is the hard part. A professor of mine (perhaps unethically...but I think he knew I was of-age) once urged me to sit in a dim room with a glass of wine and contemplate my subject. I've found that advice quite helpful. However, I would imagine it extends to any relaxing activity. Just relax and let the subject take over your mind until you find a glaring fault in the general argument. Once found, consider a solution--or you can just argue that incredible fault. Regardless, it will be strong and that is what a thesis really needs to be...even if you don't think the claim is particularly strong.
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