APA Style
Lupfer, G., Sigel, P. (2017).
Walter Gropius, 1883-1969 : the promoter of a new form .
Köln ; [Paris]:
Taschen.
MLA Style
Lupfer, Gilbert., Sigel, Paul.
"Walter Gropius, 1883-1969 : the promoter of a new form".
Köln ; [Paris]:
Taschen,
2017.
Text.