The castle of Otranto,
by Horace Walpole. The mysteries of Udolpho, by Ann Radcliffe (abridged) Northanger Abbey, by Jane Austen. Edited with an introd. by Andrew Wright.

APA Citation

Walpole, H., Wright, A., Austen, J., Radcliffe, A. Ward. (1963). The castle of Otranto. New York: Holt, Rinehart and Winston.

MLA Citation

Walpole, Horace, 1717-1797, Andrew Wright, Jane Austen, and Ann Ward Radcliffe. The Castle of Otranto. New York: Holt, Rinehart and Winston, 1963.

Warning: These citations may not always be complete (especially for serials).