Note: Links are provided for your convenience. I receive no commission. Many of these books are also available at your local library.
Attached: The New Science of Adult Attachment and How it Can Help You Find -- and keep -- love, Amir Levine MD and Rachel S. F. Heller, MA
John Bowlby's classic works, which started the concept of Attachment, can be found in 3 volumes:
Vol 1: Attachment,, John Bowlby, MD
Vol 2: Separation: Anxiety and Anger, John Bowlby, MD
Vol 3: Loss: Attachment and Loss, John Bowlby, MD
The Developing Mind: How Relationships and the Brain Interact to Shape Who we Are, Daniel J. Siegal
The Smart but Scattered Guide to Success, Ped Dawson, EdD and Richard Guare, PhD
Synaptic Self, Joseph LeDoux
Change Your Brain, Change your Life, Daniel G. Amen, MD
The Brain That Changes Itself, Normal Doidge, PhD
The Developing Mind: How Relationships and the Brain Interact to Shape Who We Are, Daniel J. Siegal
The Emerging Mind: New Discoveries in Consciousness, Karen Nesbitt Shanor
Nonviolent Communication: A Language of Life, Marshall B. Rosenberg, PhD
Words That Hurt, Words That Heal: How the Words you Choose Shape Your Destiny, Joseph Telushkin
Attached. The New Science of Adult Attachment and How it Can Help You Find -- and keep -- love, Amir Levine MD and Rachel S. F. Heller, MA
For Women Only, Shaunti Feldhahn
For Men Only, Shaunti and Jeff Feldhahn
Disentangling from Emotionally Immature People, Lindsay C. Gibson, PsyD
Men are from Mars; Women are from Venus, John Gray, PhD
How to be the Love You Seek: Break Cycles, Find Peace and Heal Your Relationships, Dr. Nicole LePera, the Holistic Psychologist
The Couples Comfort Book: A Creative Guide for Renewing Passion, Pleasure & Commitment, Jennifer Louden
The Dance of Intimacy: A Woman’s Guide to Courageous Acts of Change in Key Relationships, Harriet Goldhor Lerner
For Better or For Worse: Divorce Reconsidered, E. Mavis Hetherington and John Kelly