Collection: Karl Marx and Frederick Engels Correspondence 1870-1895 Letter ID: 220p367v44 Date: 1872-05-07 Source: Karl Marx and Frederick Engels: Collected Works. Vol. 44. London: Lawrence and Wishart, 1989
Collection: Ezra Pound Letters 1907-1941 Letter ID: 2_p36 Date: 21-10-1908 Source: D. D. Paige, ed., The Letters of Ezra Pound, 1907-1941. London : Faber and Faber, 1951.
Collection: Ezra Pound Letters 1907-1941 Letter ID: 302_p366 Date: 25-12-1935 Source: D. D. Paige, ed., The Letters of Ezra Pound, 1907-1941. London : Faber and Faber, 1951.