MLA

Brodsky, Joseph, 1940-1996. Children's poems, typescript. Box 53 | Folder 929. undated. https://collections.library.yale.edu/catalog/17306001.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 53 | Folder 929"])(undated)[Children's poems, typescript]. https://collections.library.yale.edu/catalog/17306001.