Plan Z blueprint for the German naval construction program finalized in 1938,
envisaged building 4 aircraft carriers, but none were operational when war broke
out. Also work was started on 26 August 1942 on converting the Heavy cruiser Seydlitz
into an aircraft carrier.
Warships, 1815-1945: Major Surface Vessels.
Warships, 1815-1945: U-boats and Mine Warfare Vessels.
German warships of the Second World War.
For a complete list of sources