APA (7th ed.) Citation

Opie, I. A., & Opie, P. (1980). A nursery companion. Oxford University Press.

Chicago Style (17th ed.) Citation

Opie, Iona Archibald, and Peter Opie. A Nursery Companion. Oxford ; New York: Oxford University Press, 1980.

MLA (9th ed.) Citation

Opie, Iona Archibald, and Peter Opie. A Nursery Companion. Oxford University Press, 1980.