APA (7th ed.) Citation

Ginsburg, S., Greibach, S., & Hopcroft, J. E. (1969). Studies in abstract families of languages. American Mathematical Society.

Chicago Style (17th ed.) Citation

Ginsburg, Seymour, Sheila Greibach, and John E. Hopcroft. Studies in Abstract Families of Languages. Providence, Rhode Island: American Mathematical Society, 1969.

MLA (9th ed.) Citation

Ginsburg, Seymour, et al. Studies in Abstract Families of Languages. American Mathematical Society, 1969.