Mehring, Franz. Karl Marx: the story of his life. - Ann Arbor, Estados Unidos University of Michigan Press. 1962 - xxv, 575 p. 20 cm. - Ann Arbor Paperbacks; 73. . Bibliografía: p. 557-565. Subjects--Personal Names: MARX, KARL, 1818-1883. Dewey Class. No.: 146.3/M369M4s