Mandel, E., Langston, R., & Freeman, A. (1984). Ricardo, Marx, Sraffa: The Langston memorial volume. London: Verso.
Lua i Stíl Chicago (17ú heag.)Mandel, Ernest, Robert Langston, agus Alan Freeman. Ricardo, Marx, Sraffa: The Langston Memorial Volume. London: Verso, 1984.
Lua MLA (8ú heag.)Mandel, Ernest, et al. Ricardo, Marx, Sraffa: The Langston Memorial Volume. London: Verso, 1984.
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