Hallworth, G., & Lisa, K. (1996). Sleep tight. Cambridge University Press ; New Delhi.
Lua i Stíl Chicago (17ú heag.)Hallworth, Grace, agus Kopper Lisa. Sleep Tight. Cambridge : Cambridge house: Cambridge University Press ; New Delhi, 1996.
Lua MLA (8ú heag.)Hallworth, Grace, agus Kopper Lisa. Sleep Tight. Cambridge University Press ; New Delhi, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.