APA (7th ed.) Citation

Dante Alighieri, Merwin, W. S., DeGraw, S., & Roberts, S. (2001). A sonnet. University of Iowa Center for the Book.

Chicago Style (17th ed.) Citation

Dante Alighieri, W. S. Merwin, Shari DeGraw, and Sarah Roberts. A Sonnet. [Iowa City]: University of Iowa Center for the Book, 2001.

MLA (9th ed.) Citation

Dante Alighieri, et al. A Sonnet. University of Iowa Center for the Book, 2001.