This book was not released in book stores due to legal problems with Nintendo.
As a result, the “e-book” edition is available for free as a downloadable PDF.
Programming The Nintendo Game Boy Advance by Jonathan S. Harbour

The Programming The Nintendo Game Boy Advance by Jonathan S. Harbour by Ricardo Saramago, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.
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This is great! I was looking for a book on gameboy development and I came across your blog. Thanks for this post!!! BTW, your blog is great!