(1979). Christof Drexel: 1886 - 1979 ; Symposion-Exhibition concerning work and personality. Christof Drexel.
Citazione stile Chigago Style (17a edizione)"Christof Drexel: 1886 - 1979 ; Symposion-Exhibition Concerning Work and Personality." Christof Drexel 1979.
Citatione MLA (8a ed.)"Christof Drexel: 1886 - 1979 ; Symposion-Exhibition Concerning Work and Personality." Christof Drexel, 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.