References
- Porta , P. L. 1979 . "Ricardo's Unpublished Last Words on the Subject of Value." . Rivista Internazionale di Science Economiche e Commerdali , 26 ( 1 ) : 7 – 35 .
- Porta , P. L. 1995 . "How Piero Sraffa Found Ricardo's Letters to Mill." . Cambridge Journal of Economics , 19 ( 2 ) : 353 – 7 .
- Sraffa , P. , ed. The Works and Correspondence of David Ricardo , vols. I-XI , 1951 – 73 . Cambridge : Cambridge University Press .
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