APA (7th ed.) Citation

Walpole, H., & Lewis, W. S. (1973). Selected letters of Horace Walpole. Yale University Press.

Chicago Style (17th ed.) Citation

Walpole, Horace, and W. S. Lewis. Selected Letters of Horace Walpole. New Haven: Yale University Press, 1973.

MLA (9th ed.) Citation

Walpole, Horace, and W. S. Lewis. Selected Letters of Horace Walpole. Yale University Press, 1973.