MLA

Bonds, Margaret, 1913-1972. Hyacinth (song). Box 4 (Oversize), folder 21. undated. https://collections.library.yale.edu/catalog/16818896.

APA, 6th edition

Bonds, Margaret, 1913-1972. (["Box 4 (Oversize), folder 21"])(undated)[Hyacinth (song)]. https://collections.library.yale.edu/catalog/16818896.