Christof Siemes; Georg Etscheit; Claas Tatje; Karin Ceballos Betancur; Gunhild Lütge (31 May 2012). "Flaschenkunde". Die Zeit. Archived from the original on 11 July 2012. Retrieved 5 January 2017.
weihenstephaner.de
"Our Beers". Bayerische Staatsbrauerei Weihenstephan. Retrieved 5 December 2018.
Christof Siemes; Georg Etscheit; Claas Tatje; Karin Ceballos Betancur; Gunhild Lütge (31 May 2012). "Flaschenkunde". Die Zeit. Archived from the original on 11 July 2012. Retrieved 5 January 2017.