Start with high-confidence depression books, then narrow by subgenre or adjacent topics.
Overcoming Depression, 3rd Edition
Demitri Papolos
Why Am I Still Depressed? Recognizing and Managing the Ups and Downs of Bipolar II and Soft Bipolar Disorder
Jim Phelps, James Phelps
Finally Hopeful
James Greenblatt MD, Bill Gottlieb CPHC
Perfect Chaos
Linea Johnson, Cinda Johnson
Marking Time
Herbert Rappaport
Overcoming Destructive Beliefs, Feelings, and Behaviors
Albert Ellis
Lost Connections
Johann Hari, Audible Studios
Feeling Great
David D. Burns MD, David D. Burns