L'albero di prua qui raffigurato è quello a struttura tubolare massiccia installato sulla SMS Kaiser e sulla SMS Friedrich der Grosse. La Kaiserin era equipaggiata con un albero a palo. Si veda Gröner, p. 26. (EN) Erich Gröner, German Warships: 1815–1945, vol. 1, Annapolis, Naval Institute Press, 1990, ISBN0-87021-790-9, OCLC22101769.
Herwig, p. 144. (EN) Holger Herwig, "Luxury" Fleet: The Imperial German Navy 1888-1918, Amherst, New York, Humanity Books, 1980, ISBN978-1-57392-286-9, OCLC57239454.
Herwig, pp. 149-150. (EN) Holger Herwig, "Luxury" Fleet: The Imperial German Navy 1888-1918, Amherst, New York, Humanity Books, 1980, ISBN978-1-57392-286-9, OCLC57239454.
Herwig, p. 161. (EN) Holger Herwig, "Luxury" Fleet: The Imperial German Navy 1888-1918, Amherst, New York, Humanity Books, 1980, ISBN978-1-57392-286-9, OCLC57239454.
Herwig, p. 252. (EN) Holger Herwig, "Luxury" Fleet: The Imperial German Navy 1888-1918, Amherst, New York, Humanity Books, 1980, ISBN978-1-57392-286-9, OCLC57239454.
Herwig, p. 256. (EN) Holger Herwig, "Luxury" Fleet: The Imperial German Navy 1888-1918, Amherst, New York, Humanity Books, 1980, ISBN978-1-57392-286-9, OCLC57239454.
Herwig, pp. 254-255. (EN) Holger Herwig, "Luxury" Fleet: The Imperial German Navy 1888-1918, Amherst, New York, Humanity Books, 1980, ISBN978-1-57392-286-9, OCLC57239454.
Herwig, p. 255. (EN) Holger Herwig, "Luxury" Fleet: The Imperial German Navy 1888-1918, Amherst, New York, Humanity Books, 1980, ISBN978-1-57392-286-9, OCLC57239454.