Cita APA (7a ed.)

Ryall, E., Russell, W., & MacLean, M. (2013). The philosophy of play. Routledge.

Cita Chicago Style (17a ed.)

Ryall, Emily, Wendy Russell, y Malcolm MacLean. The Philosophy of Play. London ; New York: Routledge, 2013.

Cita MLA (8a ed.)

Ryall, Emily, et al. The Philosophy of Play. Routledge, 2013.