APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Hopcroft, John E., and Jeffrey D. Ullman. Formal Languages and Their Relation to Automata / John E. Hopcroft, Jeffrey D. Ullman. Reading(Mass.) ; London: Addison-Wesley Publishing Company, 1969.

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.