APA (7th ed.) Citation

Cather, W., & Lindemann, M. (1999). O pioneers! Oxford University Press.

Chicago Style (17th ed.) Citation

Cather, Willa, and Marilee Lindemann. O Pioneers! Oxford ; New York: Oxford University Press, 1999.

MLA (9th ed.) Citation

Cather, Willa, and Marilee Lindemann. O Pioneers! Oxford University Press, 1999.