Sostra : proučbane na rimskata krajp''tna stanciâ i kastel na p''tâ eskus - Filipopolis = Sostra : investigations of the way station and fortress on the oescus - Philippopolis road. - Khristov, Ivan,‏ ‎ 1970-‏ (Bibliophilia, 2006)
Cover title: "Sostra : investigations of the way station and fortress on the oescus - Philippopolis road"
At head of title: Nacionalen istoričeski muzej