MLA

Ferro, Robert (1941-1988). Iowa Writers' Workshop. Box 1, folder 17. 1965. https://collections.library.yale.edu/catalog/17099442.

APA, 6th edition

Ferro, Robert (1941-1988). (["Box 1, folder 17"])(1965)[Iowa Writers' Workshop]. https://collections.library.yale.edu/catalog/17099442.