Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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