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Permission Marketing: Strangers into Friends into CustomersPermission Marketing: Strangers into Friends into Customers by Seth Godin
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A radical change for most marketers. Often misused but still offers great potential.
The 22 Immutable Laws of MarketingThe 22 Immutable Laws of Marketing by Al Ries
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No matter how much new 'e' there is, some things are truly 'immutable'.
The One-to-one Future: Building Business Relationships One Customer at a TimeThe One-to-one Future: Building Business Relationships One Customer at a Time by Don Peppers
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Some will thing this book 'tired' but the vision has continued to motivate a thousand entrepreneurs.