Senn, Alfred Erich (1976). "The Myth of German Money during the First World War". Soviet Studies. 28 (1): 83–90. doi:10.1080/09668137608411043. JSTOR150283.
Senn, Alfred Erich (1976). "The Myth of German Money during the First World War". Soviet Studies. 28 (1): 83–90. doi:10.1080/09668137608411043. JSTOR150283.
(in German)Pößneck, Ehrenfried Lenin als Kontrahent von Parvus im Jahr 1917. Schkeuditz : GNN-Verlag, 1997. ISBN3-932725-05-0; D. Stove, The question about Parvus (1991).