 
                            
                        
                        
                        Source: Principles of Economics (1998-), Ch. 2. Thinking Like an Economist; p. 30
Source: Contributions to Modern Economics (1978), Chapter 7, Marx, Marshall and Keynes, p. 75
Source: Principles of Economics (1998-), Ch. 2. Thinking Like an Economist; p. 30
                                        
                                        Preface to the Paperback Edition, p. vii 
The Death of Economics (1994)
                                    
Source: 1940s, Economic Analysis, 1941, p. 3
"The Effect of Government on Economic Efficiency." 1988
William Sharpe’s February 1992 lecture at Trinity University: in: William Breit, Barry T. Hirsch (2009). Lives of the Laureates: Twenty-three Nobel Economists. p. 172
Chester W. Wright (1941). Economic History of the United States, p. xi-xii " Wright (1941)
Source: 1950s–1970s, Maximum Principles in Analytical Economics, 1970, p. 62: Lead paragraph
                                        
                                        Preface to first edition. 
The theory of environmental policy, 1988
                                    
 
                            
                        
                        
                         
                            
                        
                        
                        