The Data on Income from Independent Professional Practice
    Published Date 
  
  
    Copyright 1945
  
  
    ISBN 0870140442
  
 
                  - 
      Copy CitationMilton Friedman and Simon Kuznets, Income from Independent Professional Practice (NBER, 1954), chap. 2, https://www.nber.org/books-and-chapters/income-independent-professional-practice/data-income-independent-professional-practice.