Update README.md

README.md

@@ -32,4 +32,5 @@ Do note, however, for examples involving play-through, that you should be using
 mic and speaker close to each other will produce some gnarly feedback.  
 
 ### Want to learn the nitty-gritty of Core Audio?
-If you want to get down and dirty, if you want to get brave and get close to the hardware, I can only point you to the places where I learned how to do this stuff. Chris Adamson and Michael Tyson are two giants in the field of iOS audio, and they each wrote indispensable blog posts ([this is Chris's](http://www.subfurther.com/blog/2009/04/28/an-iphone-core-audio-brain-dump/), [this is Michael's](http://atastypixel.com/blog/using-remoteio-audio-unit/)). Also, Chris Adamson now has a [whole gosh-darned BOOK on Core Audio](http://www.amazon.com/Learning-Core-Audio-Hands-On-Programming/dp/0321636848). I would have done unspeakable things to get my hands on this when I was first starting.
+If you want to get down and dirty, if you want to get brave and get close to the hardware, I can only point you to the places where I learned how to do this stuff. Chris Adamson and Michael Tyson are two giants in the field of iOS audio, and they each wrote indispensable blog posts ([this is Chris's](http://www.subfurther.com/blog/2009/04/28/an-iphone-core-audio-brain-dump/), [this is Michael's](http://atastypixel.com/blog/using-remoteio-audio-unit/)). Also, Chris Adamson now has a [whole gosh-darned BOOK on Core Audio](http://www.amazon.com/gp/product/0321636848/ref=as_li_ss_tl?ie=UTF8&tag=tico07-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0321636848
+). I would have done unspeakable things to get my hands on this when I was first starting.