Riordan, Rick. <br/><br/>
Heroes of Olympus, The Book Three: Mark of Athena, The-Heroes of Olympus, The Book Three. 

 - 672  p. 
<br/><br/> Heroes of Olympus, The Book Three: Mark of Athena, The-Heroes of Olympus, The Book Three by Rick Riordan (2014) 
<br/><br/><label>ISBN: </label>1423142004