Even thought both Audibles and Goodreads are owned by Amazon, there is not an easy way to add Audible books to your Goodreads account. You must manually add them like any book that is found outside of Amazon (even though they are technically not outside of Amazon). You can find instructions on how to add books outside of Amazon here.
In order to better know where my books are located, I created an audiobook folder. If the book has been read and also marked audiobook, then I know that I read the book via audiobook. If it is also marked in my borrowed folder, then I know that I do not own that book. If it is not marked in my borrowed folder then I know that I have that book on Audibles.
I could make a seperate folder to mark each book that I actually own. However, I feel that it would be redundant with my borrowed folder.
Now that you know how to add all your books on Amazon the series is going to focus on the interaction between Kindle and Goodreads. What other things do you want to know? Let me know in the comments below.