Enid Blyton. (1957). The Secret Seven Mystery: Secret Seven Mystery. Hodder Children's Books.
Lua i Stíl Chicago (17ú heag.)Enid Blyton. The Secret Seven Mystery: Secret Seven Mystery. Great Britain: Hodder Children's Books, 1957.
Lua MLA (9ú heag.)Enid Blyton. The Secret Seven Mystery: Secret Seven Mystery. Hodder Children's Books, 1957.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.