Cita APA (7a ed.)

Hopcroft, J. E., & Ullman, J. D. (1969). Formal languages and their relation to automata. Addison-Wesley.

Cita Chicago Style (17a ed.)

Hopcroft, John E., y Jeffrey D. Ullman. Formal Languages and Their Relation to Automata. Reading, Massachusetts [etc.]: Addison-Wesley, 1969.

Cita MLA (9a ed.)

Hopcroft, John E., y Jeffrey D. Ullman. Formal Languages and Their Relation to Automata. Addison-Wesley, 1969.