Coba jelasin Lihat pula dari Indulgensi dong

Sacred Apostolic Penitentiary (Vatican); Enchiridion of Indulgences: Norms and Grants, trans. by William T. Barry from the Second Rev. Ed. of the Enchiridion indulgentiarum ... with English Supplement; 1969, Catholic Book Publishing Co. N.B.: "Originally published by Libreria Editrice Vaticana, 1968." Without ISBN

Edward N. Peters, A Modern Guide to Indulgences: Rediscovering This Often Misinterpreted Teaching, Hillenbrand Books, Mundelein, Illinois, 2008