Gulvin, J. (2000). The covenant. Orion.
Lua i Stíl Chicago (17ú heag.)Gulvin, Jeff. The Covenant. London: Orion, 2000.
Lua MLA (8ú heag.)Gulvin, Jeff. The Covenant. Orion, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.