MLA

Brodsky, Joseph, 1940-1996. Persson, Hasse. Box 142, folder 3144. 1987. https://collections.library.yale.edu/catalog/2008150.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 142, folder 3144"])(1987)[Persson, Hasse]. https://collections.library.yale.edu/catalog/2008150.