Robert Michel : 1918-1930.

MLA

Salzmann, Siegfried. Robert Michel : 1918-1930. London: Annely Juda Fine Art London, 1982.

APA

Salzmann, S. (1982). Robert Michel : 1918-1930. London: Annely Juda Fine Art London.

Chicago

Salzmann, Siegfried Robert Michel: 1918-1930. London: Annely Juda Fine Art London, 1982.