APA (7th ed.) Citation

Cather, W. (1989). O pioneers! (Bantam classic edition.). Bantam Books.

Chicago Style (17th ed.) Citation

Cather, Willa. O Pioneers! Bantam classic edition. New York: Bantam Books, 1989.

MLA (9th ed.) Citation

Cather, Willa. O Pioneers! Bantam classic edition. Bantam Books, 1989.

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