APA (7th ed.) Citation

Henry, O., Hansen, H., & Groth, J. (1965). The stories of O. Henry. Heritage Press.

Chicago Style (17th ed.) Citation

Henry, O., Harry Hansen, and John Groth. The Stories of O. Henry. New York: Heritage Press, 1965.

MLA (8th ed.) Citation

Henry, O., et al. The Stories of O. Henry. Heritage Press, 1965.