Helfferich, Karl, 1872-1924 (Personal Name)

Shokumin gyōsei soshiki kaikakuron, 1905.

Helfferich, Karl. Der Weltkrieg, 1919: title page (Karl Helfferich)

LC data base, August 27, 1990 (hdg.: Helfferich, Karl Theodor, 1872-1924; usage: Karl Helfferich)

Brockhaus Enzyklopädie (Helfferich, Karl; born July 22, 1872, in Neustadt an der Haardt; died April 23, 1924, in a train accident near Bellinzona; politician and financier)

Nichi-Ro no senshi, 1906: title page (Karu Heruferihhi [in Jpn.]; professor at the University of Berlin)

German Wikipedia, viewed October 13, 2022 (Karl Helfferich; full name: Karl Theodor Helfferich; born July 22, 1872, in Neustadt an der Haardt (now Neustadt an der Weinstrasse); died April 23, 1924, in Bellinzona, Switzerland; German economist, banker, and politician; after 1918, he was active in the Deutschnationale Volkspartei and was known as a major figure among German right-wing antisemitic groups)

Deutsche Nationalbibliothek online catalog, viewed October 13, 2022 (authorized access point: Helfferich, Karl; other data in authority record: Prof.; born 1924 in Neustadt an der Haardt; died 1924 in Bellinzona in a train accident; German economist, political scientist and author; obtained his doctorate in economics (Dr. oec. publ.) in 1894; served in several high offices in German banks; served as vice-chancellor of the German Reich in 1917; active in the Deutschnationale Volkspartei; served as a member of the German Parliament (Reichstag) in 1920)