MLA

Gombrowicz, Witold, 1904-1969. Lavelli, Jorge. Box 7, folder 223-225. 1960-69, n.d.. https://collections.library.yale.edu/catalog/2007775.

APA, 6th edition

Gombrowicz, Witold, 1904-1969. (["Box 7, folder 223-225"])(1960-69, n.d.)[Lavelli, Jorge]. https://collections.library.yale.edu/catalog/2007775.