Apostolic Letter Motu Proprio of the Supreme Pontiff Francis: "Learn to take your Leave" Governing the Resignation, for reason of age, of holders of certain offices subject to papal appointment - Franziskus Papst (Euart, Sharon A. (edt), Alesandro, John A. 1941- (edt), Roman replies and CLSA advisory opinions / 2018 Roman Replies and CLSA Advisory Opinions 2018, 2018)