Cite

Shawn, Ted. Advertisement for "Shawn and His Ensemble of Men Dancers" (in Series III)

MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Shawn, Ted. Advertisement for "Shawn and His Ensemble of Men Dancers" (in Series III). Box 118, folder 2812. n.d.. https://collections.library.yale.edu/catalog/2017518.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 118, folder 2812"])(n.d.)[Shawn, Ted. Advertisement for "Shawn and His Ensemble of Men Dancers" (in Series III)]. https://collections.library.yale.edu/catalog/2017518.