Chipperfield, R. O. (192). Ethel opens the door: An exploit of the Shadowers. Hurst and Blackett.
Lua i Stíl Chicago (17ú heag.)Chipperfield, Robert Orr. Ethel Opens the Door: An Exploit of the Shadowers. London: Hurst and Blackett, 192.
Lua MLA (9ú heag.)Chipperfield, Robert Orr. Ethel Opens the Door: An Exploit of the Shadowers. Hurst and Blackett, 192.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.