http://www.amazon.com/Hal-Leonard-Guitar-Method-Book/dp/0793533929
Edit: $17 for the set here:
http://www.amazon.com/Hal-Leonard-Guitar-Method-Complete/dp/B000RQ73GQ
About $6 for the first one on Amazon. $25 for the entire set of 3 books. Doesn't look like it's anything particularly special compared to many other guitar books out there. I'm not a full access member here, but I can assume that GT teaches you the same things in the book. You can use the book as a reference or an additional thing to learn from. I've been working on a book from the Berklee college of music, plus one by Frederick Noad which is pretty popular.
Long story short, there are tons of books/websites that you can learn from. You you don't have to limit yourself to just 1 thing. Just read through the book from the beginning. Not sure exactly what you are asking though.
