APA (7th ed.) Citation

Simon and Garfunkel, Simon, P., & Garfunkel, A. (1981). Collected works. Columbia.

Chicago Style (17th ed.) Citation

Simon and Garfunkel, Paul Simon, and Art Garfunkel. Collected Works. New York, NY: Columbia, 1981.

MLA (9th ed.) Citation

Simon and Garfunkel, et al. Collected Works. Columbia, 1981.