2011 - Sophomore Undercover (Paperback) → Hardcover ISBN-13: 9781423113058 ISBN-10: 1423113055 Genre: Teen & Young Adult ? 2009 - Sophomore Undercover (Hardcover) → Paperback ISBN-13: 9781423113034 ISBN-10: 1423113039 Genres: Children's Books, Teen & Young Adult ? |