Marx, Karl. “The Poverty of Philosophy”. Marxists Internet Archive. 2008년 5월 23일에 확인함. The hand-mill gives you society with the feudal lord; the steam-mill society with the industrial capitalist.
Vulgar Economy in Marxian Garb: A Critique of Temporal Single System Marxism, Gary Mongiovi, 2002, Review of Radical Political Economics 34:4, p. 393. "Marx did make a number of errors in elaborating his theory of value and the profit rate .... [H]is would-be Temporal Single System defenders ... camouflage Marx's errors." "Marx's value analysis does indeed contain errors." (abstract)