"PRESS RELEASE: Disney Book Group Launches Rick Riordan's New Five-Book Series, The Heroes of Olympus, on October 12 with a Live Webcast from the Laydown Event for Book 1, The Lost Hero".
Truy cập ngày 8 tháng 4 năm 2013.  ^ “PRESS RELEASE: Disney Book Group Launches Rick Riordan's New Five-Book Series, The Heroes of Olympus, on October 12 with a Live Webcast from the Laydown Event for Book 1, The Lost Hero”.