German V-Weapon Sites 1943-45 - Steven J. Zaloga
Oxford: Osprey Publishing, Paperback, 2007, Paperback £11.80
Scapa Flow: The Defences of Britain?s Great Fleet Anchorage 1914-45 - Angus Konstam
Oxford: Osprey Publishing, Paperback, 2009, Paperback £9.80U-Boat Bases and Bunkers 1941-45 - Gordon Williamson
Oxford: Osprey Publishing, Paperback, 2003, Paperback £11.80