APA (7th ed.) Citation

Walpole, H. E. o. O. (1909). Horace Walpole's letters: A selection. Cassell.

Chicago Style (17th ed.) Citation

Walpole, Horace Earl of Oxford. Horace Walpole's Letters: A Selection. London: Cassell, 1909.

MLA (9th ed.) Citation

Walpole, Horace Earl of Oxford. Horace Walpole's Letters: A Selection. Cassell, 1909.