These are the recommended relationship books that can be found on Amazon:

The Five Love Languages - Gary Chapman
Tell Me No Lies - Ellyn Bader, Ph.D
The Five Languages of Apology - Gary Chapman & Jennifer Thomas
What Smart couples Know - Patricia Covalt
The Lost Art of Listening - Michael P. Nichols
You just Don't Understand: Women and Men in Conversation - Deborah Tannen
Spiritual Connections: How to Find Spirituality Throughout all the Relationships in your Life - Sylvia Browne
Connect: 12 Vital ties that Open your Heart, Lengthen your Life, and Deepen your Soul - Edward Hallowell


These are books recommended for enrichment and self-help:

You Can Be Happy No Matter What: Five Principles for Keeping Life in Perspective - Richard Carlson & Wayne Dyer
True Love: A Practice for Awakening the Heart - Thich Nhat Hanh
Living an Extraordinary Life - Robert White
Developing Self-Esteem: A guide for Positive Success - Connie Palladino
Don't Sweat the Small Stuff Workbook - Richard Carlson
Connect: 12 Vital ties that Open your Heart, Lengthen your Life, and Deepen your Soul - Edward Hallowell