The Underground Railroad [excerpts?]
MLA
Poston, Ted, 1906-1974 . The Underground Railroad [excerpts?]. Box 1 | Folder 16. undated. https://collections.library.yale.edu/catalog/10563197.
APA, 6th edition
Poston, Ted, 1906-1974 . (["Box 1 | Folder 16"])(undated)[The Underground Railroad [excerpts?]]. https://collections.library.yale.edu/catalog/10563197.