== Further readings section == 

 Number 1 (Robert Spector (2001). amazon.com—Get Big Fast: Inside the Revolutionary Business Model That Changed the World. Harper Collins Publishers. ISBN 0-06-662041-4.) and number 4 (Robert Spector (2000). Amazon.com. HarperCollins Publishers. ISBN 0-06-662041-4.) shares the same ISBN but different publishing year, which one is correct?