Claasen، Adam (2007). "The German Invasion of Norway, 1940: The Operational Intelligence Dimension". Journal of Strategic Studies. ج. 27 ع. 1: 114–135. DOI:10.1080/0140239042000232792. ISSN:0140-2390.
Claasen، Adam (2007). "The German Invasion of Norway, 1940: The Operational Intelligence Dimension". Journal of Strategic Studies. ج. 27 ع. 1: 114–135. DOI:10.1080/0140239042000232792. ISSN:0140-2390.