Sutherland, J. (1931). Undertow. Cassell.
Lua i Stíl Chicago (17ú heag.)Sutherland, Joan. Undertow. London : Melbourne: Cassell, 1931.
Lua MLA (8ú heag.)Sutherland, Joan. Undertow. Cassell, 1931.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.