Byrne, R. (2008). The Secret. PT.Gramedia Pustaka Utama.
Lua i Stíl Chicago (17ú heag.)Byrne, Rhonda. The Secret. PT.Gramedia Pustaka Utama, 2008.
Lua MLA (8ú heag.)Byrne, Rhonda. The Secret. PT.Gramedia Pustaka Utama, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.