APA (7th ed.) Citation

Smullyan, R. M. (1987). Forever undecided: A puzzle guide to Gödel (1. ed.). Knopf.

Chicago Style (17th ed.) Citation

Smullyan, Raymond M. Forever Undecided: A Puzzle Guide to Gödel. 1. ed. New York: Knopf, 1987.

MLA (9th ed.) Citation

Smullyan, Raymond M. Forever Undecided: A Puzzle Guide to Gödel. 1. ed. Knopf, 1987.

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