Bipolar Disorder The prevalence of bipolar disorder (BD) has increased dramatically over the last 20 years, particularly in children and young adults, and this title in the Diseases and Disorders series discusses several leading theories. Library Bound Book Library Bound Book List: $41.53 / S&L: $33.22 Reading Level: 12-12+ Interest Level: 7-10 Product type: Library Bound Book ISBN: 978-1-4205-0853-6 Copyright: 2012 Language: English