Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.