Cita APA (7a ed.)

Hallworth, G., & Lisa, K. (1996). Sleep tight. Cambridge University Press ; New Delhi.

Cita Chicago Style (17a ed.)

Hallworth, Grace, y Kopper Lisa. Sleep Tight. Cambridge : Cambridge house: Cambridge University Press ; New Delhi, 1996.

Cita MLA (8a ed.)

Hallworth, Grace, y Kopper Lisa. Sleep Tight. Cambridge University Press ; New Delhi, 1996.