Note: Sorry if this is the wrong place to post a type of message such as this.

I want to buy a book on aerodynamics but I have found myself lost. I have tried to look around for books to buy. I searched google books but to no luck.

I am looking for a book that can explain the theoretical explanation of flight and then go into a more mathematical explanation at the end. I have tried looking over the internet for aerodynamic resources on websites and have only found one true source, http://www.grc.nasa.gov/WWW/K-12/airplane/bga.html. It’s the first website that pops up on google. All the other sites I have come across explain that there is some kind of war going on between theories. I found on one site saying another site's explanation of flight was wrong yet the other website says the same thing about this one's theory as well. On some websites I even found them saying that some old books have incorrect information in them. So you can see I have lost my way on what information to trust, except nasa's website. But their information is in a more web like by topic form making it hard for me to understand.

Yea, so any one's help would be greatly appreciated by me.
If I need any more information on the subject please say so and I will try to explain as best as I can.