Claus Helberg (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Claus Helberg" in Catalan language version.

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google.cat

books.google.cat

Gallagher, Thomas. Assault In Norway: Sabotaging the Nazi Nuclear Program. Guilford, Connecticut: The Lyons Press, 2002. ISBN 1-58574-750-5. ^{[Enllaç no actiu]}

nytimes.com

Saxon, Wolfgang «Claus Helberg, 84, War Hero In the Norwegian Resistance». The New York Times, 13-03-2003.

worldcat.org

Kagge, Erling. El Silenci en temps de soroll: l'aventura d'aïllar-se del món, p. 94-95. ISBN 978-84-297-7615-7.