Sigurdsson. Viking Friendship. Cornell University Press.
Lua i Stíl Chicago (17ú heag.)Sigurdsson. Viking Friendship. Cornell University Press.
Lua MLA (8ú heag.)Sigurdsson. Viking Friendship. Cornell University Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.