Lahtinen, Anu, and Terhi Katajamäki. “SEALED WITH TEARS: MATERIAL AND SOCIAL MEANINGS OF A ROYAL LETTER BY COUNTESS PALATINE ANNA (VASA) (1545–1610)”. Prace Polonistyczne, vol. 76, Oct. 2021, pp. 217-35, doi:10.26485/PP/2021/76/9.