How to backup ibooks not purchased through itunes?

I have an iphone 4gs. I have lots of books in my ibooks. Most of them were not purchased through itunes. When i connect my iphone to my laptop, itunes pops up and all the new books are uploaded to my itunes on my laptop. When i delete an ibook from my iphone, it still shows up in my itunes. When I reconnect, it also turns back up on my iphone. I'm struggling a bit for storage space so i wanted to delete all my ibooks from my iphone that i have already read. How do I take the ibooks from my iphone but still "keep" them if I want to reread them at a later date?

I don't want them to keep popping back on my iphone every time i connect to itunes. But i also don't want to lose my ibooks because I have no more space for new books.

Can anyone help? Please?

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