DeLong, J. Bradford. 2000. “Cornucopia: The Pace of Economic Growth in the Twentieth Century.” Working Paper 7602. National Bureau of Economic Research. http://bit.ly/2fQxcXn. См. также: DeLong, J. Bradford. 1998. “Estimating World GDP, One Million B. C. — Present.” http://bit.ly/2fCWomN.
