MLA

Doesburg, Theo van, 1883-1931. Bauhausbücher 6. [1925]. https://collections.library.yale.edu/catalog/10268521.

APA, 6th edition

Doesburg, Theo van, 1883-1931. ([1925])[Bauhausbücher 6]. https://collections.library.yale.edu/catalog/10268521.