Παραπομπή APA

Rick Riordan. (2011). The lost hero (Riordan, Rick.). Puffin.

Παραπομπή Chicago Style

Rick Riordan. The Lost Hero. Riordan, Rick. London: Puffin, 2011.

Παραπομπή MLA

Rick Riordan. The Lost Hero. Riordan, Rick. Puffin, 2011.