Lipgens, W. (1986). Documents on the History of European Integrations: Plans for European Union in Great Britain and in Exile 1939 -1945. DeGruyter.

Lipgens, Walter. Documents on the History of European Integrations: Plans for European Union in Great Britain and in Exile 1939 -1945. Berlin; New York: DeGruyter, 1986.

Lipgens, Walter. Documents on the History of European Integrations: Plans for European Union in Great Britain and in Exile 1939 -1945. DeGruyter, 1986.