Selling the Invisible

 Harry Beckwit

 Positioning- The battle for your mind

 Al Ries & Jack Trout

Differentiate or Die: Survival in Our Era of Killer Competition

Jack Trout & Steve Rivkin

Building Brand Identity: A Strategy for Success in a Hostile Marketplace

Lynn B. Upshaw

Purple Cow: Transform Your Business by Being Remarkable

Seth Godin

From Selling to Serving: The Essence of Client Creation

 Lou Cassara

Influence: The Psychology of Persuasion

Robert B. Cialdini

The Heart and Art of NetWeaving

Robert S. Littell

The Relationship Edge in Business

Jerry Acuff & Wally Wood