Frederick IV, Duke of Swabia (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Frederick IV, Duke of Swabia" in English language version.

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doi.org

Vagnoni, Mirko (September 2021). "Frederick II of Hohenstaufen (1208–1250)". Encyclopedia. 1 (3): 710–719. doi:10.3390/encyclopedia1030055. ISSN 2673-8392.

worldcat.org

search.worldcat.org

Vagnoni, Mirko (September 2021). "Frederick II of Hohenstaufen (1208–1250)". Encyclopedia. 1 (3): 710–719. doi:10.3390/encyclopedia1030055. ISSN 2673-8392.