MLA

Gombrowicz, Witold, 1904-1969. Gálvez, Manuel. Box 4, folder 111. 1947, n.d.. https://collections.library.yale.edu/catalog/2007765.

APA, 6th edition

Gombrowicz, Witold, 1904-1969. (["Box 4, folder 111"])(1947, n.d.)[Gálvez, Manuel]. https://collections.library.yale.edu/catalog/2007765.