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Dick Pels: Hendrik de Man and the ideology of Planism. In: International Review of Social History. Band32, Nr.3, Dezember 1987, ISSN0020-8590, S.206–229, doi:10.1017/s0020859000008488.
Erik Hansen: Depression Decade Crisis: Social Democracy and Planisme in Belgium and the Netherlands, 1929–1939. In: Journal of Contemporary History. Band16, Nr.2, 1981, ISSN0022-0094, S.293–322, JSTOR:260576.