APA (7th ed.) Citation

Frost, R., Ciardi, J., & Horton, R. (1980). A sound portrait of Robert Frost. National Public Radio.

Chicago Style (17th ed.) Citation

Frost, Robert, John Ciardi, and Russell Horton. A Sound Portrait of Robert Frost. Washington, D.C.: National Public Radio, 1980.

MLA (9th ed.) Citation

Frost, Robert, et al. A Sound Portrait of Robert Frost. National Public Radio, 1980.