Cita APA (7a ed.)

Warren, R. P., Perkins, J. A., & Hendricks, R. (2015). Selected Letters of Robert Penn Warren: Backward Glances and New Visions, 1969-1979. Project Muse.

Cita Chicago Style (17a ed.)

Warren, Robert Penn, James A. Perkins, y Randy Hendricks. Selected Letters of Robert Penn Warren: Backward Glances and New Visions, 1969-1979. Baltimore, Maryland: Project Muse, 2015.

Cita MLA (8a ed.)

Warren, Robert Penn, et al. Selected Letters of Robert Penn Warren: Backward Glances and New Visions, 1969-1979. Project Muse, 2015.