O'Sullivan, V. (1973). Bearings. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)O'Sullivan, Vincent. Bearings. Wellington, New York: Oxford University Press, 1973.
Lua MLA (8ú heag.)O'Sullivan, Vincent. Bearings. Oxford University Press, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.