Heppenstall, R. (1968). The connecting door. Dufour.
Lua i Stíl Chicago (17ú heag.)Heppenstall, Rayner. The Connecting Door. [Chester Springs, Pa.]: Dufour, 1968.
Lua MLA (9ú heag.)Heppenstall, Rayner. The Connecting Door. Dufour, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.