APA (7th ed.) Citation

Hofstadter, D. R. (1999). Godel, Escher, Bach: An eternal golden braid (20th anniversary ed.). Penguin Books.

Chicago Style (17th ed.) Citation

Hofstadter, Douglas R. Godel, Escher, Bach: An Eternal Golden Braid. 20th anniversary ed. London: Penguin Books, 1999.

MLA (8th ed.) Citation

Hofstadter, Douglas R. Godel, Escher, Bach: An Eternal Golden Braid. 20th anniversary ed. Penguin Books, 1999.

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