Hopcroft, John E.,  1939- <br/><br/>
Introduction to Automata Theory, Languages, and Computation  
/John E. Hopcroft, Jeffrey D. Ullman. 
 - Reading, Mass. :  Addison-Wesley,  c1979. 
 - x, 418 p. :  ill. ;  24 cm. 
 - Addison-Wesley series in computer science .