APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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