Hopcroft, J. E., Motwani, R., & Ullman, J. D. (2001). Introduction to automata theory, languages, and computation (Second edition.). Addison-Wesley.

Hopcroft, John E., Rajeev Motwani, and Jeffrey D. Ullman. Introduction to Automata Theory, Languages, and Computation. Second edition. Boston: Addison-Wesley, 2001.

Hopcroft, John E., et al. Introduction to Automata Theory, Languages, and Computation. Second edition. Addison-Wesley, 2001.