封建制度 (歐洲) (Chinese Wikipedia)
Analysis of information sources in references of the Wikipedia article "封建制度 (歐洲)" in Chinese language version.
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archive.org
- Larsen, Karen. A History of Norway. Princeton, New Jersey: Princeton University Press. 1948: 201.
- Scott, Franklin D. Sweden: The Nation's History
. Minneapolis: University of Minnesota Press. 1977: 58. ISBN 978-0-8166-0804-1.
web.archive.org
- Reader's Companion to Military History. [2004-11-12]. （原始内容存档于2004-11-12）.