The book will show you what you need to do so that you are not making up your own opinions. You should also keep in mind that the goal here is to make an interesting topic for your Holocaust essay. It can be hard to do if you're not prepared.
The assignment in your college requires you to write a Holocaust essay. Make sure to get a guide to do this. It should be fairly simple to find, but you can also do a search on the Internet and find a good book at a price you can afford.