APA (7th ed.) Citation

Smullyan, R. M. (1961). Theory of formal systems: Smullyan Raymond M. Princeton University Press.

Chicago Style (17th ed.) Citation

Smullyan, Raymond M. Theory of Formal Systems: Smullyan Raymond M. Princeton, N.J.: Princeton University Press, 1961.

MLA (8th ed.) Citation

Smullyan, Raymond M. Theory of Formal Systems: Smullyan Raymond M. Princeton University Press, 1961.

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