Trask, G. S. (1952). The key to the other ([1st ed.].). Doubleday.
Lua i Stíl Chicago (17ú heag.)Trask, Georgianne Sampson. The Key to the Other. [1st ed.]. Garden City, N.Y.: Doubleday, 1952.
Lua MLA (8ú heag.)Trask, Georgianne Sampson. The Key to the Other. [1st ed.]. Doubleday, 1952.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.