Start with high-confidence the creative mind books, then narrow by subgenre or adjacent topics.
Flow
Mihaly Csikszentmihalyi, Mihály Csíkszentmihályi
Writing on Both Sides of the Brain
Henriette A. Klauser
The Artist's Way
Julia Cameron
Creative Process in Gestalt Therapy
Joseph Zinker
The Creative Act
Rick Rubin
Drawing on the Right Side of the Brain
Betty Edwards
The Synesthesia Experience
Maureen Seaberg
Doom and Bloom
Campbell Walker
Creative DBT Activities Using Music
Deborah Spiegel