APA (7th ed.) Citation

Asimov, I. (1989). Foundation's edge. Ballantie Books.

Chicago Style (17th ed.) Citation

Asimov, Isaac. Foundation's Edge. New York: Ballantie Books, 1989.

MLA (9th ed.) Citation

Asimov, Isaac. Foundation's Edge. Ballantie Books, 1989.

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