APA (7th ed.) Citation

Cather, W., Jewell, A., & Stout, J. P. (2013). The selected letters of Willa Cather. Alfred A. Knopf.

Chicago Style (17th ed.) Citation

Cather, Willa, Andrew Jewell, and Janis P. Stout. The Selected Letters of Willa Cather. New York: Alfred A. Knopf, 2013.

MLA (9th ed.) Citation

Cather, Willa, et al. The Selected Letters of Willa Cather. Alfred A. Knopf, 2013.