I am not a dude. And how the heck would I know it wasn't in English - especially in light of the fact that you want to note it is being released using English words. Logic would then have it - that the book is in English.
Is the book in English? If so, I would imagine you have a proofreader and if so why wouldn't you ask your proofreader?
Not that we are not willing to help - just an odd question to ask for the English term for a non-English book?