APA (7th ed.) Citation

Smullyan, R. M. (1962). Theory of formal systems (Rev. ed.). Princeton Univ. Pr.

Chicago Style (17th ed.) Citation

Smullyan, Raymond M. Theory of Formal Systems. Rev. ed. Princeton, N. J: Princeton Univ. Pr, 1962.

MLA (9th ed.) Citation

Smullyan, Raymond M. Theory of Formal Systems. Rev. ed. Princeton Univ. Pr, 1962.

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