Riordan, R. (2012). The Heroes of Olympus The Mark of Athena. Penguin Books Ltd.
Chicagoスタイル(17版)引用形式Riordan, Rick. The Heroes of Olympus The Mark of Athena. Penguin Books Ltd, 2012.
MLA(8版)引用形式Riordan, Rick. The Heroes of Olympus The Mark of Athena. Penguin Books Ltd, 2012.
警告: この引用は必ずしも正確ではありません.