Byrne, R. (2006). The Secret. Simon & Schuster.
Lua i Stíl Chicago (17ú heag.)Byrne, Rhonda. The Secret. London: Simon & Schuster, 2006.
Lua MLA (9ú heag.)Byrne, Rhonda. The Secret. Simon & Schuster, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.