<Li> Jump up ^ Chris Knight, 2012 . Engels was Right: Early Human Kinship was Matriliineal...</Li> <Li> Jump up ^ Knight, C. 2008 . "Early human kinship was matrilineal". In N.J. Allen, H. Callan, R. Dunbar and W. James (eds .), Early Human Kinship . Oxford: Blackwell, pp. 61--82 . </Li>

Friedrich engels the origin of the family private property and the state