Gray, S. (1820). Remarks on the production of wealth, and the influence, which the various classes of society have, in carrying on that process: in a letter to the Rev. T.R. Malthus, occasioned by his attempt to maintain the division of classes into productive and unproductive. London: [s.n.].MLA Citation
Gray, Simon. Remarks On the Production of Wealth, And the Influence, Which the Various Classes of Society Have, In Carrying On That Process: In a Letter to the Rev. T.R. Malthus, Occasioned by His Attempt to Maintain the Division of Classes Into Productive And Unproductive. London: [s.n.], 1820.
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