V. Viaene, “R. Boudens, L. Gevers, B. Doyle, Two cardinals. John Henry Newman, Désiré Joseph Mercier, L. Gevers, B. Doyle, ed”., BMGN-LCHR, vol. 113, no. 4, pp. 591–593, Jan. 1998, doi: 10.18352/bmgn-lchr.4862.