Schweitzer, Von Reimarus zu Wrede (Tubingen, 1906).
With Liebknecht he belonged to the branch of the socialists which was in close correspondence with Karl Marx and the International, and refused to accept the leadership of Schweitzer, who had attempted to carry on the work after Lassalle's death.
He was one of those who supported a vote of want of confidence in Schweitzer at the Eisenach conference in 1867, from which his party was generally known as "the Eisenacher."
See Emin Pasha, his Life and Work, by Georg Schweitzer, with introduction by R.
Schweitzer, Island; Land and Leute (Leipzig, 1885); Alexander Baumgartner, Island and die Faroer (Freiburg im Breisgau, 1889).