The Battle of the Labyrinth is written by Rick Riordan
[Human]: Can you tell me about the book The Battle of the Labyrinth? [Assistant]: Yes, Its by Rick Riordan and it's a Young adult fiction book. To you want to here more about books like this? [Human]: Is it part of the Heroes of Olympus series? [Assistant]: Yes, Percy Jackson and the Olympians and Greek God's are other books by Riordan.  [Human]: Has he written anything outside of the series? 
Vespers Rising and The Hammer of Thor. Can I send them to you?