In his "A History of Economic Ideas," Robert Lekachman has a short section called "Papal
Economics."
The following are some of the main writings that touch on this subject.  
  
Leo XIII, Encyclical Letter Rerum Novarum (1891)  
   On Capital And Labor   
 http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-
xiii_enc_15051891_rerum-novarum_en.html
  
  
Leo XIII, Encyclical Letter Libertas (1888)  
   On The Nature Of Human Liberty  
   http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-
xiii_enc_20061888_libertas_en.html
  
  
Pius XI, Encyclical Letter Quadragesimo Anno (1931)  
   On Reconstruction Of The Social Order  
 http://www.vatican.va/holy_father/pius_xi/encyclicals/documents/hf_p-
xi_enc_19310515_quadragesimo-anno_en.html
  
  
John XXIII, Encyclical Letter Mater et Magistra (1961)  
   On Christianity And Social Progress  
 http://www.vatican.va/holy_father/john_xxiii/encyclicals/documents/hf_j-
xxiii_enc_15051961_mater_en.html
  
  
Paul VI, Encyclical Letter Populorum Progressio (1967)  
   On The Development Of Peoples  
 http://www.vatican.va/holy_father/paul_vi/encyclicals/documents/hf_p-
vi_enc_26031967_populorum_en.html
  
  
John Paul II, Encyclical Letter Laborem Exercens (1981)  
   On Human Work  
   http://www.vatican.va/edocs/ENG0217/_INDEX.HTM  
  
  
John Paul II, Encyclical Letter Sollicitudo Rei Socialis (1987)  
   on the twentieth anniversary of "Populorum Progressio"  
   http://www.vatican.va/edocs/ENG0223/_INDEX.HTM  
  
  
John Paul II, Encyclical Letter Centesimus Annus (1991)  
   On the hundredth anniversary of Rerum Novarum  
   http://www.vatican.va/edocs/ENG0214/_INDEX.HTM  
  
  
Michael Nuwer