What has the author Isabel W Koehler written?

Gerhart Waeger has written:

'Die Su?ndenbo?cke der Schweiz' -- subject(s): Censorship, Neutrality, Volksbund fu?r die Unabha?ngigkeit der Schweiz, World War, 1939-1945

'Gottfried von Bouillon in der Historiographie' -- subject(s): Crusades, Historiography