Pope Benedict XVI, Peter Seewald (2002). “God and the World: Believing and Living in Our Time : a Conversation with Peter Seewald”, p.199, Ignatius Press
"Mass, Imposition of the Pallium And Conferral of the Fisherman's Ring For the Beginning of the Petrine Ministry Of the Bishop of Rome". Speech by Pope Benedict XVI at the St. Peter's Square, w2.vatican.va. April 24, 2005.