Cite

Alphabet pour Gratte-ciel (from Series VI)

MLA

Chopin, Henri, 1922-2008. Alphabet pour Gratte-ciel (from Series VI). Box 82 (Oversize). undated. https://collections.library.yale.edu/catalog/17289286.

APA, 6th edition

Chopin, Henri, 1922-2008. (["Box 82 (Oversize)"])(undated)[Alphabet pour Gratte-ciel (from Series VI)]. https://collections.library.yale.edu/catalog/17289286.