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