Resources

Tutorial:

1. How to Get & Install Flex and Bison? : http://nsu-compiler.blogspot.com/2014/04/how-to-get-install-flex-bison.html
2. Write a Toy Compiler with Flex and Bison : http://gnuu.org/2009/09/18/writing-your-own-toy-compiler/
3. A complete tutorial with Bison And Flex : http://epaperpress.com/lexandyacc/download/LexAndYaccTutorial.pdf
4. How to write Flex file and compile: http://www.yzuda.org/tutorials/flex_bison/01/
5. A Complete Tutorial on Flex: http://courses.softlab.ntua.gr/compilers/flex.pdf
6. Bridging Bison and Flex : http://fhoerni.free.fr/comp/bison_flex.html
7. Introduction to Flex : http://nsu-compiler.blogspot.com/2014/04/introduction-to-flex.html
8. Concepts of Bison: http://nsu-compiler.blogspot.com/2014/05/concepts-of-bison.html

Books: 

1. Flex Bison Book from O'Really : http://web.iitd.ac.in/~sumeet/flex__bison.pdf‎
2. A Book from University Professor: http://foja.dcs.fmph.uniba.sk/kompilatory/docs/compiler.pdf‎