MLA

Howe, Susan, 1937-. Poster: David von Schlegell Drawings and Sculptures, May 12-June 6 1976, Institute of Contemporary Art, Boston. 77 (Broadside). 1959-1976, undated. https://collections.library.yale.edu/catalog/16867324.

APA, 6th edition

Howe, Susan, 1937-. (["77 (Broadside)"])(1959-1976, undated)[Poster: David von Schlegell Drawings and Sculptures, May 12-June 6 1976, Institute of Contemporary Art, Boston]. https://collections.library.yale.edu/catalog/16867324.