the most simple way to say that is '(watashi no) hon wa doko desu ka'
'dochira' is more like 'which'.
and I'm not sure but I think that if you want to add polite preffix to 'book' you use 'go' not 'o', so it should be 'gohon'. but I'm not sure about it, I think the easiest way is just to say 'hon'.