from the Peachpit site (http://www.peachpit.com), go to Explore >> About Us. Choose Contact Us. Choose eBook Lesson Files Help. Here are the instructions (note: after the index or go to the last page which should be the back cover and scroll backwards - If it still isn't appearing, contact the publisher):
Here's the list verbatim:
Contact Us
eBook Lesson Files Help
Where are the lesson files?
All of Peachpit's eBooks contain the same content as the print copies. In terms of media content, you should find a link within the first or last few pages of each eBook that will direct you to the media files. Often eBooks open to the first page of the first chapter, and you must scroll back several pages to get to the front matter where the URL is located. For more current titles, you can locate the URL after the index.
Some other helpful tips:
If you are able to search the book, search for "Where are the lesson files?"
Go to the very last page of the book and scroll backwards.
If you are using a Kindle device or an iPad, it will not be able to access the files directly, but entering the URL into a computer with web access will allow you to get to the files.
If you are using an iPad to access your eBook, it is possible that your display settings will cut off part of the URL. To make sure this is not the case, try reducing your font size and turning your iPad to landscape view. This should cause the full URL to appear.
Jonathan Ziegler
http://www.electrictiger.com/
520-360-8293