diff --git a/screen/ubpl/UBPL Introduction.cwiki b/screen/ubpl/UBPL Introduction.cwiki
index 0dcba81..d2ba960 100644
--- a/screen/ubpl/UBPL Introduction.cwiki	
+++ b/screen/ubpl/UBPL Introduction.cwiki	
@@ -39,7 +39,7 @@ h4. Concepts Behind This, and "HEMP"
 
 The idea of using stories (aka "narratives") like this is a common one. Part of the reason for writing them specifically in the way I've described here is to make them a good starting point for further UI and system design efforts. For those interested, this is based on a lot of research I've done over the years while trying to work more effectively with clients, and have written a book on that topic called "HEMP: An agile approach to analysis and design". HEMP stands for "Holistic Enterprise Mechanization Process". On a side note, a better word for "mechanization" is "automation", but I thought HEMP would make a more colourful and interesting title than "HEAP".
 
-The book and other details are available at: [http://www.dejc.com/HEMP]
+The book and other details are available at: [https://www.amazon.com/HEMP-agile-approach-analysis-design/dp/148418422X]
 
 h4. A Special Note on Testing