Hopcroft, J. E., Ullman, J. D., & Motwani, R. e. (2003). Introduction to automata theory,languages and computation.2nd Ed (2nd Ed.). Pearson Education.

Hopcroft, John E., Jeffrey D. Ullman, and Rajeev et Motwani. Introduction to Automata Theory,languages and Computation.2nd Ed. 2nd Ed. New Delhi: Pearson Education, 2003.

Hopcroft, John E., et al. Introduction to Automata Theory,languages and Computation.2nd Ed. 2nd Ed. Pearson Education, 2003.