On the cover is used the image of ingraving by Nicolas Van Aelst depicting a view of the St. Peter’s Basilica and the Apostolic Palace in Vatican City (before 1591). The original image is archived in SOA Plzeň, Nostická sbírka grafiky (č. M 44/29. EL NAD 104208). - (State Regional Archive in Pilsen, Nostic’s Collection of Graphic Arts).