Riordan, R. (2012). The Heroes of Olympus The Mark of Athena. Penguin Books Ltd.
Lua i Stíl Chicago (17ú heag.)Riordan, Rick. The Heroes of Olympus The Mark of Athena. Penguin Books Ltd, 2012.
Lua MLA (8ú heag.)Riordan, Rick. The Heroes of Olympus The Mark of Athena. Penguin Books Ltd, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.