Personally, I tend to read each book in isolation of the deck it may have come with, and just allow it to further my store of background knowledge.
When either doing readings or meditating or 'entering' a card, I allow the card to speak for itself, its symbols and my general background knowledge forming part of the well from which I may draw, or the lense through which I may understand what is being presented. A book, though possibly illuminating such a reading or meditation from a different perspective, may also somewhat inhibit the situation from revealing its own special 'task'.