APA (7th ed.) Citation

Salomaa, A. (1973). Formal languages. Academic Press.

Chicago Style (17th ed.) Citation

Salomaa, Arto. Formal Languages. New York: Academic Press, 1973.

MLA (9th ed.) Citation

Salomaa, Arto. Formal Languages. Academic Press, 1973.

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