Nottelmann, p. 129. Nottelmann, Dirk (2023). Wright, Christopher C. (ed.). "From "Wooden Walls" to "New-Testament Ships": The Development of the German Armored Cruiser 1854–1918, Part III: "Armor—Light Version"". Warship International. LX (2): 118–156. ISSN0043-0374.
Nottelmann, pp. 129, 131. Nottelmann, Dirk (2023). Wright, Christopher C. (ed.). "From "Wooden Walls" to "New-Testament Ships": The Development of the German Armored Cruiser 1854–1918, Part III: "Armor—Light Version"". Warship International. LX (2): 118–156. ISSN0043-0374.
Nottelmann, p. 130. Nottelmann, Dirk (2023). Wright, Christopher C. (ed.). "From "Wooden Walls" to "New-Testament Ships": The Development of the German Armored Cruiser 1854–1918, Part III: "Armor—Light Version"". Warship International. LX (2): 118–156. ISSN0043-0374.
Nottelmann, p. 132. Nottelmann, Dirk (2023). Wright, Christopher C. (ed.). "From "Wooden Walls" to "New-Testament Ships": The Development of the German Armored Cruiser 1854–1918, Part III: "Armor—Light Version"". Warship International. LX (2): 118–156. ISSN0043-0374.