- Don't Keep Me A Secret: Proven Tactics to Get Referrals and Introductions
- Get More Referrals Now!: The Four Cornerstones That Turn Business Relationships into Gold (Facts on File Science Library)
- Beyond Referrals: How to Use the Perpetual Revenue System to Convert Referrals into High-Value Clients
- The Language of Referrals
- Unlimited Referrals : Secrets That Turn Business Relationships into Gold