APA (7th ed.) Citation

Walpole, H., Scott, W., & Spurgeon, C. F. E. (1923). The castle of Otranto. Chatto & Windus.

Chicago Style (17th ed.) Citation

Walpole, Horace, Walter Scott, and Caroline F. E. Spurgeon. The Castle of Otranto. London: Chatto & Windus, 1923.

MLA (9th ed.) Citation

Walpole, Horace, et al. The Castle of Otranto. Chatto & Windus, 1923.