From Percy Jackson: Camp Half-Blood Confidential-An Official Rick Riordan Companion Book: Your Real Guide to the Demigod Training Camp (Trials of Apollo)

From Percy Jackson: Camp Half-Blood Confidential-An Official Rick Riordan Companion Book: Your Real Guide to the Demigod Training Camp (Trials of Apollo)

The Trials of Apollo: Camp Jupiter Classified-An Official Rick Riordan Companion Book: A Probatio's Journal

The Demigod Diaries (The Heroes of Olympus)