APA (7th ed.) Citation

Opie, I. A., & Opie, P. (1959). The lore and language of schoolchildren. At the Clarendon Press.

Chicago Style (17th ed.) Citation

Opie, Iona Archibald, and Peter Opie. The Lore and Language of Schoolchildren. Oxford: At the Clarendon Press, 1959.

MLA (9th ed.) Citation

Opie, Iona Archibald, and Peter Opie. The Lore and Language of Schoolchildren. At the Clarendon Press, 1959.