Alois Hitler (English Wikipedia)

Payne, Robert (1973). The Life and Death of Adolf Hitler. New York: Praeger. p. 12. "The marriage took place early in the morning, and Klara is said to have complained: "We were married at six o'clock in the morning, and my husband was already at work at seven."

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"Adolf Hitler parents' tombstone in Austria removed". BBC News. 30 March 2012. Archived from the original on 24 January 2025. Retrieved 15 June 2014.

"Adolf Hitler parents' tombstone in Austria removed". BBC News. 30 March 2012. Archived from the original on 24 January 2025. Retrieved 15 June 2014.

Fischel, Jack (1998). The Holocaust. Greenwood. pp. 137–. ISBN 978-0-313-29879-0.
Koppensteiner, Rudolf (1937). Die Ahnentafel des Führers. Retrieved 25 January 2013.
Hamann, Brigitte & Momsen, Hans (2010). Hitler's Vienna: A Portrait of the Tyrant as a Young Man. Tauris Parke. pp. 50ff. ISBN 978-1-84885-277-8.
Fuchs, Daniel. The Limits of Ferocity: Sexual Aggression and Modern Literary Rebellion, p. 124 (Duke University Press, 2011).
Rhodes, Richard. Masters of Death: The SS-Einsatzgruppen and the Invention of the Holocaust, p. 29 (Knopf Doubleday Publishing Group, 2007)

"Family Tree DNA questions reporting about Hitler's origins" (PDF). FamilyTreeDNA. Archived from the original (PDF) on 21 May 2013. Retrieved 3 July 2015.

"Hatte Hitler jüdische Vorfahren?" [Did Hitler have Jewish ancestors?]. Holocaust-Referenz (in German).

Langer, Walter. ""Hitler As He Knows Himself"". Nizkor.org. Archived from the original on 22 July 2017. Retrieved 15 June 2014.

Alois petitioned the church for an episcopal dispensation citing "bilateral affinity in the third degree touching the second" to describe his rather complicated family relationship to Klara. The local bishop apparently believed this relationship was too close to approve on his own authority, so he forwarded the petition to Rome on behalf of Alois, seeking instead a papal dispensation, which was approved before the birth of the couple's first child. See Rosenbaum, Ron "Explaining Hitler: Chapter One" The New York Times
Kershaw, Ian. "Hitler 1889–1936: Hubris: Chapter One". The New York Times.

"Lineage of Adolf Hitler – Density inbreeding". Der Spiegel.
"Hitler – Kein Ariernachweis" [Hitler – No proof of Aryan descent]. Der Spiegel (in German). Fest steht, daß Adolf Hitler den Ariernachweis, den er den meisten Deutschen abverlangte, für seine Person kaum hätte erbringen können. Sein Großvater väterlicherseits ist unbekannt. [It is certain that Adolf Hitler would hardly have been able to provide the proof of Aryan descent for himself that he demanded of most Germans. His paternal grandfather is unknown.]

"Family Tree DNA questions reporting about Hitler's origins" (PDF). FamilyTreeDNA. Archived from the original (PDF) on 21 May 2013. Retrieved 3 July 2015.
Langer, Walter. ""Hitler As He Knows Himself"". Nizkor.org. Archived from the original on 22 July 2017. Retrieved 15 June 2014.