MLA

Marinetti, F. T., 1876-1944. Reginald Arkell. “Somebodies and Nobodies. no. 21 Jacob Epstein.” Pan, 27 March 1920. [1844-1]. box 24, slide 24. 1920. https://collections.library.yale.edu/catalog/10651274.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 24, slide 24"])(1920)[Reginald Arkell. “Somebodies and Nobodies. no. 21 Jacob Epstein.” Pan, 27 March 1920. [1844-1]]. https://collections.library.yale.edu/catalog/10651274.