Brash, R. R. (1860). The round tower controversy: The belfry theory examined.
Lua i Stíl Chicago (17ú heag.)Brash, Richard Rolt. The Round Tower Controversy: The Belfry Theory Examined. 1860.
Lua MLA (9ú heag.)Brash, Richard Rolt. The Round Tower Controversy: The Belfry Theory Examined. 1860.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
