(en) Thorkild Kjaergaard, Castles around the Baltic Sea: the illustrated guide, Castle Museum, , 77 p. (ISBN9788386206032, lire en ligne)
(en) Stephen Turnbull, Crusader Castles of the Teutonic Knights (2): The stone castles of Latvia and Estonia 1185–1560, Bloomsbury Publishing, , 41 p. (ISBN9781849080187, lire en ligne)
(de) Constantin Mettig, Baltische Städte : Skizzen aus der Geschichte Liv-, Est- und Kurlands, Riga, Jonck und Poliewsky, , 241–242 p. (lire en ligne)
(en) Thorkild Kjaergaard, Castles around the Baltic Sea: the illustrated guide, Castle Museum, , 78 p. (ISBN9788386206032, lire en ligne)