I found that amusing too when I originally saw it back whenever, and still think its proper funny now! Keep `em coming !
That is one almost identical to the one I found randomly some place akin to your one, the only diff being my one had 'Terrorism for Dummies' in place of the word Presidency I'm sure!....) but nevermind, each are equally apt in proving he's a Dummie.
I remember him saying how influential "The Very Hungry Caterpillar" was on him during his formative years. This in spite of the fact that the book was published in 1969 when Mr. Bush was protecting national security in the Texas Air National Guard (s******).