Aus der Art geschlagen. Berlin: Der Bücherkreis, 1930
“During approximately two-and-a-half years he designed around twenty-five books for the Bücherkreis, in which he was able to test the applicability of a modern style to literature and to put into practice his demand in Eine Stunde Druckgestaltung for ‘cheap books, not private-press editions; active literature, not passive leather-bindings’. Such an aim fitted well with the aims of the Bücherkreis, which had been founded in 1924 by an educational committee set up by the Social Democratic Party”.
Christopher Burke. Active literature: Jan Tschichold and New Typography. London: Hyphen Press, 2007 (p. 204)