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Fleming, Peter. Operation Sealion. Simon & Schuster, New York - 1957.

Wheatley, Ronald. Operation Sealion. Oxford University Press, Oxford (U.K.) - 1958.

Schenk, Peter. Landung in England. Oberbaum Verlag, Berlin - 1987. translated in English as Invasion of England, 1940: the planning of Operation Sealion. Conway, London - 1990.
The book supplies a very interesting and detailed account of the generally unknown and very creative German preparation for Britain’s invasion. This shows that the invasion was much more than a theoretical idea. There had been heavy preparation for it.