奥尔登堡公国 (Chinese Wikipedia)
Analysis of information sources in references of the Wikipedia article "奥尔登堡公国" in Chinese language version.
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books.google.com
- Franz Heinrich Ungewitter. Europe, Past and Present: A Comprehensive Manual of European Geography and History. Putnam. 1854: 422 [2021-01-24]. （原始内容存档于2021-03-16）.
state.gov
history.state.gov
- A Guide to the United States’ History of Recognition, Diplomatic, and Consular Relations, by Country, since 1776: Oldenburg. Office of the Historian, Foreign Service Institute. [2021-01-24]. （原始内容存档于2021-01-31）.
web.archive.org
- Franz Heinrich Ungewitter. Europe, Past and Present: A Comprehensive Manual of European Geography and History. Putnam. 1854: 422 [2021-01-24]. （原始内容存档于2021-03-16）.
- A Guide to the United States’ History of Recognition, Diplomatic, and Consular Relations, by Country, since 1776: Oldenburg. Office of the Historian, Foreign Service Institute. [2021-01-24]. （原始内容存档于2021-01-31）.
wikisource.org
en.wikisource.org
- 本条目包含来自公有领域出版物的文本: Chisholm, Hugh (编). Oldenburg. Encyclopædia Britannica 20 (第11版). London: Cambridge University Press: 71, 72. 1911.
