Fichier:Engels 1856.jpgDescriptionEngels 1856.jpg Friedrich Engels in 1868 Date 1868 Source http://en.wikipedia.org/wiki/Image:Engelss56fe1.jpg, uploaded 2006-01-16 by w:User:Bronks
Fichier:Max stirner.jpgEspañol: Max Stirner Max Stirner (1806-1856) portraited by Friedrich Engels (1820–1895), made circa 1892, taken from a 1900 essay on Stirner by John Henry
Fichier:Marx and Engels.jpgbytes) A picture of Karl Marx and Friedrich Engels. Karl Marx is ancient and dead, along with Friedrich Engels. Therefore, the photographer must also be
Fichier:WikiCon 2023 Programmheft.pdf(https://commons.wikimedia.org/wiki/File:Linz_ARS_Electronica_Center_blau_DL.jpg),
„Linz ARS Electronica Center blau DL“, https://creativecommons.org/licenses/by-sa/3