You can download "Risk and Uncertainty" for free in two different formats:

• enhaced pdf - you can read it on Windows and Mac with Acrobat Reader. 
  Download pdf
   
• ePub 3 - you can read it on Mac, iPad and iPhone with iBooks, on Windows with Readium app and on Android tablet and smartphone with Publiwide Reader app, available for free on Play Store.
  Download ePub