Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.