Collection: Ezra Pound Letters 1907-1941 Letter ID: 121_p162 Year: 1917 Source: D. D. Paige, ed., The Letters of Ezra Pound, 1907-1941. London : Faber and Faber, 1951.
Collection: Selected Correspondence of Charles Ives Letter ID: 163 Year: 1936 Source: Tom C. Owens, ed. (2007). Selected Correspondence of Charles Ives. Berkeley: University of California Press.
Collection: Ezra Pound Letters 1907-1941 Letter ID: 122_p163 Date: 18-04-1917 Source: D. D. Paige, ed., The Letters of Ezra Pound, 1907-1941. London : Faber and Faber, 1951.