Cita APA (7a ed.)

Wilkinson, P. F. (1980). Innovation in play environments. C. Helm.

Cita Chicago Style (17a ed.)

Wilkinson, Paul F. Innovation in Play Environments. London: C. Helm, 1980.

Cita MLA (9a ed.)

Wilkinson, Paul F. Innovation in Play Environments. C. Helm, 1980.