1. Benedict XVI (2009) Encyclical Letter ‘Caritas in Veritate’ on love in truth
2. Francis (2015) Encyclical-Letter ‘Laudato si’, on the Catholic vision of ecology
3. John Paul II (1981) Encyclical-Letter ‘Laborem Exercerns’ on human work
4. John Paul II (1987) Encyclical-Letter ‘Sollicitudo rei socialis’ on human development
5. John Paul II (1991) Encyclical-Letter ‘Centesimus annus’ on economy and society