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Source: An Essay on The Principle of Population (First Edition 1798, unrevised), Chapter V, paragraph 3, lines 5-8
Source: The principles of political economy, 1825, p. 95-96
Source: (1776), Book I, Chapter I
Source: The Principles of Political Economy and Taxation (1821) (Third Edition), Chapter V, On Wages, p. 52
On why Mexicans cross the border in “The Borders of Our Lives” https://www.americantheatre.org/2018/02/26/the-borders-of-our-lives/ (American Theatre; Feb 2018)
                                        
                                        Section 1, paragraph 30, lines 3-8. 
The Manifesto of the Communist Party (1848)
                                    
Vegetarianism in the Light of Theosophy(1913), p. 18-20
                                        
                                        Speech to the Dulwich Conservative Association (29 February 1964), from A Nation Not Afraid. The Thinking of Enoch Powell (B. T. Batsford Ltd, 1965), p. 75 
1960s
                                    
Source: The Wealth of Nations (1776), Book IV, Chapter I, p. 471.
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        