@book{ 0-1153632357, title = {Burg Pirna - Landesfestung Sonnenstein: Entwicklung und Bedeutung}, series = {Sonnenstein}, author = {Böhm, Boris}, editor = {Böhm, Boris}, address = {Pirna}, publisher = {Kuratorium Gedenkstätte Sonnenstein e.V.}, year = {1999}, language = {German}, url = {https://katalog.skd.museum/Record/0-1153632357} }