Lua APA (7ú heag.)

(1979). Christof Drexel: 1886 - 1979 ; Symposion-Exhibition concerning work and personality. Christof Drexel.

Lua i Stíl Chicago (17ú heag.)

"Christof Drexel: 1886 - 1979 ; Symposion-Exhibition Concerning Work and Personality." Christof Drexel 1979.

Lua MLA (8ú heag.)

"Christof Drexel: 1886 - 1979 ; Symposion-Exhibition Concerning Work and Personality." Christof Drexel, 1979.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.