Barr, J. (1957). Quatrefoil: By James Barr [Pseud.]. Vision.
Lua i Stíl Chicago (17ú heag.)Barr, James. Quatrefoil: By James Barr [Pseud.]. London: Vision, 1957.
Lua MLA (8ú heag.)Barr, James. Quatrefoil: By James Barr [Pseud.]. Vision, 1957.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.