Cita APA (7a ed.)

Williams, W. C., & Gregory, H. (1956). In the American grain: Essays. New Directions.

Cita Chicago Style (17a ed.)

Williams, William Carlos, y Horace Gregory. In the American Grain: Essays. New York: New Directions, 1956.

Cita MLA (9a ed.)

Williams, William Carlos, y Horace Gregory. In the American Grain: Essays. New Directions, 1956.