APA (7th ed.) Citation

Opie, I. A. (1993). The people in the playground. Oxford University Press.

Chicago Style (17th ed.) Citation

Opie, Iona Archibald. The People in the Playground. Oxford, England ; New York: Oxford University Press, 1993.

MLA (9th ed.) Citation

Opie, Iona Archibald. The People in the Playground. Oxford University Press, 1993.