Umm is that really important? Assuming the scans are available online and someone comes acroos a reference like "in some book on page 234" and they want to look up the reference can't they just access the scanned book from say google books and look it up?
My point is that this is a rare usage scenario so perhaps the better solution is no solution. Just making scanned copies available freely online should be sufficient.
Now addressing actual ways of doing this is you disagree with me. Perhaps this should be left up to the reader apps. i.e. use some semantic tagging of content to indicate which page it comes from, then if the user selects "reference mode" in the reader app, the reader should be responsible for displaying the reference information.
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