APA (7th ed.) Citation

Asimov,Isaac. (1991). Prelude to foundation. Bantam Books.

Chicago Style (17th ed.) Citation

Asimov,Isaac. Prelude to Foundation. New York: Bantam Books, 1991.

MLA (9th ed.) Citation

Asimov,Isaac. Prelude to Foundation. Bantam Books, 1991.

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