APA (7th ed.) Citation

Undset, S., & Nunnally, T. (2000). The Cross. Penguin Books.

Chicago Style (17th ed.) Citation

Undset, Sigrid, and Tiina Nunnally. The Cross. New York: Penguin Books, 2000.

MLA (9th ed.) Citation

Undset, Sigrid, and Tiina Nunnally. The Cross. Penguin Books, 2000.