Gómez-Iglesias Casal, Valentín, “Proposal in the early 1960s for Opus Dei to be a personal prelature”, en Hayward, Paul V. (ed.), Studies on the Prelature of Opus Dei: On the Twenty-Fifth Anniversary of the Apostolic Constitution Ut sit: Pontifical University of the Holy Cross, Montréal, Wilson & Lafleur, 2009,  pp. 173-186.