The Doomsday Key  :  a z Sigma force novel  / 
Rollins James  . 
 - New York:  William Morrow ,  2009. 
 - xii,431 p,: 
<br/><br/><label>ISBN: </label>9780061231407 
<br/><br/><label>LC Class. No.: </label>PS3568  / .R64  2009