MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952, Moholy-Nagy, László, 1895-1946. 40 variations by Katherine S. Dreier : introduction by L. Moholy-Nagy.. [1942]. https://collections.library.yale.edu/catalog/17373270.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952, & Moholy-Nagy, László, 1895-1946. ([1942])[40 variations by Katherine S. Dreier : introduction by L. Moholy-Nagy.]. https://collections.library.yale.edu/catalog/17373270.