APA (7th ed.) Citation

Cowper, W., King, J., & Ryskamp, C. (1989). William Cowper, selected letters. Clarenden Press ; Oxford University Press.

Chicago Style (17th ed.) Citation

Cowper, William, James King, and Charles Ryskamp. William Cowper, Selected Letters. Oxford : Oxford ; New York: Clarenden Press ; Oxford University Press, 1989.

MLA (9th ed.) Citation

Cowper, William, et al. William Cowper, Selected Letters. Clarenden Press ; Oxford University Press, 1989.