- “The Art of Friendship: A Guide to Understanding and Managing Friendships” (2003)
- “The Friendship Book: Insights and Inspiration on Friendship from World Cultures and Traditions” (2006)
- “The Friendship Journal: A Guided Journey to Discover and Nurture Your Friendships” (2008)
- “The Joy of Friendship: Celebrating Every Occasion and Strengthening Your Relationships” (2010)
- “The Power of Friendship: How to Discover, Enrich, and Nurture Your Most Valuable Relationships” (2012)