Karl Paul Link

Hugh (编). Börne, Karl Ludwig. Encyclopædia Britannica 4 (第11版). London: Cambridge University Press: 255–256. 1911.  Mendes-Flohr, Paul R; Reinharz, Jehuda

B 8 [9 July 2023].  含有連結內容需訂閱查看的頁面 (link) Olympedia - René Bondoux. olympedia.org. OlyMADMen. [9 July 2023].  Karl Wilhelm Krause. catalogue.bnf.fr. Bibliothèque

Kozinn. Karl Ulrich Schnabel, Pianist, 92; Favored 4-Hand Repertory. The New York Times. 30 August 2001: B 9 [4 April 2021].  含有連結內容需訂閱查看的頁面 (link) Bert

State. Axelos, Kostas. Alienation and Techne in the Thought of Karl Marx. Blackledge, Paul. 2008. "Marxism and Ethics （页面存档备份，存于互联网档案馆）." International

New York Times. 15 April 2004: C 15 [22 August 2021].  含有連結內容需訂閱查看的頁面 (link) Paul Hamburger. data.bnf.fr. Bibliothèque nationale de France. [20 April 2024]