Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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