APA (7th ed.) Citation

Duckworth, W., & Swartz, M. (1987). Thirty-one days. Lovely Music.

Chicago Style (17th ed.) Citation

Duckworth, William, and Michael Swartz. Thirty-one Days. New York, N.Y.: Lovely Music, 1987.

MLA (9th ed.) Citation

Duckworth, William, and Michael Swartz. Thirty-one Days. Lovely Music, 1987.