MLA

Siporin, Mitchell, 1910-1976, artist. German prisoners #208 P.O.W. camp Ste. Helene Constantine [art original].. [ca. 1943 or 1944]. https://collections.library.yale.edu/catalog/17340009.

APA, 6th edition

Siporin, Mitchell, 1910-1976, artist. ([ca. 1943 or 1944])[German prisoners #208 P.O.W. camp Ste. Helene Constantine [art original].]. https://collections.library.yale.edu/catalog/17340009.