G.K. Chesterton:
What's Wrong With The World
The Outline of Sanity
Utopia of Usurers
Eugenics and Other Evils
Hilaire Belloc:
The Servile State
An Essay on the Restoration of Property
The Way Out
Fr. Vincent McNabb:
The Church and the Land
Nazareth or Social Chaos
The Catholic Land Movement
E.F. Schumacher:
Small Is Beautiful (including the landmark chapter Buddhist Economics)
Good Work
Blessed Leo XIII:
Rerum Novarum
Pius XI:
Quadragesimo Anno
Pontifical Council for Justice and Peace:
The Social Agenda (a collection of magisterial texts arranged thematically according to the significant subject areas of Catholic social doctrine)