Frederico VIII, Duque de Eslésvico-Holsácia (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Frederico VIII, Duque de Eslésvico-Holsácia" in Portuguese language version.

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books.google.com

Schleswig-Holstein Succession: Official Documents (em inglês). Kiel: Documentos oficiais de Schleswig-Holstein. 1864. p. 25
Ewald, Alexander Charles (1868). The Last Century of Universal History: A Reference Book, Containing an Annotated Table of Chronology, Lists of Contemporary Sovereigns, a Dictionary of Battles and Sieges, and Biographical Notes of Eminent In-dividuals. From 1767 to 1867 (em inglês). Londres: F. Warne & Company. p. 199