• 

  Le Corbusier (1887 - 1965) Modulor

  https://web.archive.org/web/20071002094027/http://www.tu-harburg.de/b/kuehn/lec4.html

  Le Corbusier's Proportionalsystem Modulor

• 

  Deutsche Biographie - Bürkli, Karl

  https://www.deutsche-biographie.de/gnd117667099.html#ndbcontent

  Deutsche Biographie

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