Cite

I am to my own heart merely a serf

MLA

Schwartz, Delmore, 1913-1966. I am to my own heart merely a serf. Box 3, folder 168. undated. https://collections.library.yale.edu/catalog/17405222.

APA, 6th edition

Schwartz, Delmore, 1913-1966. (["Box 3, folder 168"])(undated)[I am to my own heart merely a serf]. https://collections.library.yale.edu/catalog/17405222.