http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
German 20mm flak in World War II, 1934-1945
German twenty millimeter flak in World War II, 1934-1945
2 cm Flak im Einsatz, 1935-1945. English
Werner Müller ; [translated from the German by David Johnston].
Includes bibliographical references (page [2]).