Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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