APA (7th ed.) Citation

Smullyan, R. M. (1989). Forever undecided: A puzzle guide to Gödel (Reprint.). Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Smullyan, Raymond M. Forever Undecided: A Puzzle Guide to Gödel. Reprint. Oxford u.a: Oxford Univ. Press, 1989.

MLA (9th ed.) Citation

Smullyan, Raymond M. Forever Undecided: A Puzzle Guide to Gödel. Reprint. Oxford Univ. Press, 1989.

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