APA (7th ed.) Citation
Cather, W. (1993). O Pioneers! (First published in 1993.). Dover Publications.
Chicago Style (17th ed.) Citation
Cather, Willa. O Pioneers! First published in 1993. New York: Dover Publications, 1993.
MLA (9th ed.) Citation
Cather, Willa. O Pioneers! First published in 1993. Dover Publications, 1993.
Warning: These citations may not always be 100% accurate.