The Five Love Languages: How to Express Heartfelt Commitment to Your Mate (2005) by Gary Chapman
10 Lessons to Transform Your Marriage (2006) by John Gottman
The Relationship Cure: A 5 Step Guide to Strengthening Your Marriage, Family and Friendships (2002) by John Gottman
The Seven Principles for Making Marriage Work (2000) by John Gottman
Getting the Love You Want: A Guide for Couples by Harville Hendrix (2007)
Getting the Love You Want Workbook by Harville Hendrix
Receiving Love: Transforming Your Relationships by Letting Yourself be Loved (2004) by Harville Hendrix
Hold Me Tight: Seven Conversations for a Lifetime of Love by Susan Johnson, PhD
How to Be an Adult in Relationships: The Five Keys to Mindful Loving (2002) by David Richo
When the Past is Present: Healing the Emotional Wounds that Sabotage our Relationships (2008) by David Richo
Making Love Last: How to Sustain Intimacy and Nurture Genuine Connection (2008) by David Richo
After the Affair: Healing the Pain and Rebuilding Trust When a Partner Has Been Unfaithful , 2nd Edition (2012) by Janis Spring