<Li> Jump up ^ Karl Marx and Friedrich Engels, "The Magyar Struggle" contained in Collected Works: Volume 8, pp. 227--238 . </Li> <Li> Jump up ^ See Karl Marx and Friedrich Engels, Collected Works: Volume 8, pp. 451--480 and Volume 9, pp. 9--463 . </Li> <Li> Jump up ^ "Engels, Friedrich (encyclopedia)". Marxists.org . Retrieved 2010 - 02 - 13 . </Li> <Li> Jump up ^ Isaiah Berlin, Karl Marx: His Life and Environment, 4th ed. 1978, New York and Oxford: Oxford University Press, 1996, p. 130, ISBN 978 - 0 - 19 - 510326 - 7 . </Li>

Describe the relationship among the members of the angeles family