APA (7th ed.) Citation

Engeler, E. (1968). Formal languages: Automata and structures. Markham.

Chicago Style (17th ed.) Citation

Engeler, Erwin. Formal Languages: Automata and Structures. Chicago, Ill: Markham, 1968.

MLA (9th ed.) Citation

Engeler, Erwin. Formal Languages: Automata and Structures. Markham, 1968.