The Bipolar Child: The Definitive and Reassuring Guide to Childhood's Most Misunderstood Disorder (Revised and Expanded Edition) by Demitri Md Papolos and Janice Papolos

page 6 -- "most adults will have well intervals in between the periods of heightened or lowered mood. Bipolar Disorder in chiildren rarely fit this recongnizable pattern..."

page 7 -- "indeed our study sample showed that over 80% of the children who developed early-onset bipolar disorder had what is know as 'bilineal transmission' -- substance abuse and mood disorders appeared on both sides of their families.