MLA

Wolff, Kurt, 1887-1963. Grosz, George [with transcripts]. Box 3, folder 93. 1920-21. https://collections.library.yale.edu/catalog/2021309.

APA, 6th edition

Wolff, Kurt, 1887-1963. (["Box 3, folder 93"])(1920-21)[Grosz, George [with transcripts]]. https://collections.library.yale.edu/catalog/2021309.