APA (7th ed.) Citation

Loomis, R. S., & Loomis, L. H. (1957). Medieval romances. Modern Library.

Chicago Style (17th ed.) Citation

Loomis, Roger Sherman, and Laura Hibbard Loomis. Medieval Romances. New York: Modern Library, 1957.

MLA (9th ed.) Citation

Loomis, Roger Sherman, and Laura Hibbard Loomis. Medieval Romances. Modern Library, 1957.