Start your Engines Source Code

Start Your Engines Source Code not available any where on the internet. Trying to teach my son game programming in an effort to help him enjoy education more and can't find the neccessary files to go through the book with. As I understand it, by purchasing the book, and I bought 3 not 1, I am to have access to the source since it is not printed in the book at all. Please point out how I might rectify this issue.
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