Updated README

README.md

@@ -6,5 +6,12 @@ A cross platform Cartesian Genetic Programming Library written in C.
 Author: Andrew James Turner    
 Webpage: http://www.cgplibrary.co.uk/     
 Email: [email protected]    
-License: Lesser General Public License (LGPL)    
+License: Lesser General Public License (LGPL) 
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+If this library is used in published work I would greatly appreciate a citation to the following:  
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+A. J. Turner and J. F. Miller. [**Introducing A Cross Platform Open Source Cartesian Genetic Programming Library**](http://andrewjamesturner.co.uk/files/GPEM2014.pdf). The Journal of Genetic Programming and Evolvable Machines, 2014, 16, 83-91.
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