Should a book title be italicized if it is used in the title of an essay?

Well, it depends. If the title is, for example like this: My Essay On 'Title of your book here', then the title does need to be italicized. But if the title of your book is also the whole title of your essay then you don't need to italicize it. Sorry if I'm wrong, this is how my school taught me. Hope this helped! :)