Biggers, E. D. (1928). Behind that curtain. Bobbs-Merrill Co..
Lua i Stíl Chicago (17ú heag.)Biggers, Earl Derr. Behind That Curtain. Indianapolis: Bobbs-Merrill Co., 1928.
Lua MLA (8ú heag.)Biggers, Earl Derr. Behind That Curtain. Bobbs-Merrill Co., 1928.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.