Royston, A., King, D., Cradock-Watson, J., & Hopkins, D. (1992). Birds. Aladdin Books.
Lua i Stíl Chicago (17ú heag.)Royston, Angela, Dave King, Jane Cradock-Watson, agus Dave Hopkins. Birds. New York: Aladdin Books, 1992.
Lua MLA (8ú heag.)Royston, Angela, et al. Birds. Aladdin Books, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.