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Life and Destiny (1913)
                                    
            Section 3: A Note on Ruskin's Writings on Art and Architecture 
Ruskin Today (1964)
        
                                        
                                        Section 9 : Ethical Outlook 
Life and Destiny (1913)
                                    
Internet Encyclopedia of Philosophy
Un Art de Vivre (The Art of Living) (1939), The Art of Working
Source: Productive thinking, 1945, p. 84
Source: 1961 - 1980, transcript of a public forum at Boston university', conducted by Joseph Ablow 1966, pp. 68/69
Source: 1960s - 1970s, Guest editorial: Wicked problems (1967), p. 142 cited in: Rob Hundman (2010) Weerbarstig veranderen. p. 38
                                        
                                        Kenneth Boulding (1977) Economic Development as an Evolutionary System, Fifth World Congress of the International Economic Association, Tokyo, Aug.-Sept. 1977. 
1970s
                                    
On higher arithmetic. Mathematical Circles Adieu (1977) by Howard W. Eves
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        