Peter I, Grand Duke of Oldenburg (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Peter I, Grand Duke of Oldenburg" in English language version.

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books.google.com

Genealogie ascendante jusqu'au quatrieme degre inclusivement de tous les Rois et Princes de maisons souveraines de l'Europe actuellement vivans [Genealogy up to the fourth degree inclusive of all the Kings and Princes of sovereign houses of Europe currently living] (in French). Bourdeaux: Frederic Guillaume Birnstiel. 1768. p. 80.

"Oldenburg Royal Family". Archived from the original on 17 March 2006. Retrieved 17 June 2014.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
"Oldenburg Royal Family". Archived from the original on 17 March 2006. Retrieved 17 June 2014.{{cite web}}: CS1 maint: bot: original URL status unknown (link)