Can you explain why the Catholic Mass is out of a book?

I have a Protestant cousin who kept asking me why the Mass is “out of a book”. I think I understand why, but I’m having trouble explaining the concept of liturgical worship and where it comes from. Can you help me on how to explain this?

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Recommended Reading:
shop.catholic.com/media/catalog/product/cache/1/small_image/135x/9df78eab33525d08d6e5fb8d27136e95/b/i/biblical-walk-mass-book.jpg **A Biblical Walk Through The Mass
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