B. Guitman and Z. Ujj, “‘Remain in Our True, Pure, and Praiseworthy Faith and Religion’: Ferdinand I’s Admonitions to His Sons in the Winter of 1547”, ETSzemle, vol. 26, no. 1, pp. 111–135, Jun. 2025, doi: 10.54231/ETSZEMLE.26.2025.1.6.