How to sync iPhone to new iTunes without deleting my books?

I have a new iTunes on my laptop (PC) and I want to sync my iphone 4S but when I click sync or apply it tells me that I could lose the data. Please if someone could tell me how to sync it without erasing the books from iBooks. I don't really care about the apps but the books are very important to me so I don't wanna lose them.

You're fine. Why? That's is the general idiot warning. Why? Your phone and the new iTunes 'don't know each other yet'. When you sync it for the first time the phone might prompt you to 'trust' this new machine. Say Yes. They will then chat and sync your stuff thus making a copy of phone on iTunes. Think about it. If it's a fresh iTunes like you said there's nothing on the pc to overwrite your phone contents at all. Besides, your iTunes account on the phone will always have them. When you download something from iTunes on an Apple ID account, it's always in there unless you delete it from there for good. Best luck.

Well, not everything on the iPhone is from iTunes or appstore.

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