APA aipamena

Riordan, R. (2012). The Heroes of Olympus The Mark of Athena. Penguin Books Ltd.

Chicago Style aipamena

Riordan, Rick. The Heroes of Olympus The Mark of Athena. Penguin Books Ltd, 2012.

MLA aipamena

Riordan, Rick. The Heroes of Olympus The Mark of Athena. Penguin Books Ltd, 2012.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.