ペーター＝エーリヒ・クレーマー (Japanese Wikipedia)

Analysis of information sources in references of the Wikipedia article "ペーター＝エーリヒ・クレーマー" in Japanese language version.

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57^th place

google.co.jp

Richard Snow: A Measureless Peril: America in the Fight for the Atlantic, the Longest Battle of World War II. Scribner, 2011, ISBN 978-1-4165-9111-5, S.42 (該当ページ, p. 42, - Google ブックス)

Clay Blair（英語版）: Der U-Boot-Krieg. Band 1: Die Jäger, 1939–1942. Heyne, München 1998, ISBN 3-453-12345-X, p.554–556.
Bernard Ireland（英語版）: Battle of the Atlantic. Naval Institute Press, Annapolis 2003, ISBN 1-59114-032-3, p.103–104.
Clay Blair（英語版）: Der U-Boot-Krieg. Band 1: Die Jäger, 1939–1942. Heyne, München 1998, ISBN 3-453-12345-X, p.636–638.