^The Casualty List (Prussian) dated Dec. 23, 1914 lists under 78 IR, Ist Battalion, 4th Company Krgsfr (Kriegsfreiwilliger - War Volunteer) Karl Llewellyn verwundet (wounded)
^"Jurisprudence". West's Encyclopedia of American Law. Ed. Jeffrey Lehman, Shirelle Phelps. Detroit: Thomson/Gale, 2005.
^Shapiro، Fred R. (2000). "The Most-Cited Legal Scholars". Journal of Legal Studies. ج. 29 ع. 1: 409–426. DOI:10.1086/468080.