http://www.vatican.va/content/leo-xiii/it/encyclicals/documents/hf_l-xiii_enc_08121892_inimica-vis.html
https://caserta24ore.altervista.org/2018/05/15/papa-leone-xiii-papa-eroico-contro-la-massoneria/
http://www.vatican.va/content/leo-xiii/it/encyclicals/documents/hf_l-xiii_enc_18840420_humanum-genus.html=