Arengo, S. (1998). Three Billy-Goats. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Arengo, Sue. Three Billy-Goats. Oxford: Oxford University Press, 1998.
Lua MLA (8ú heag.)Arengo, Sue. Three Billy-Goats. Oxford University Press, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.