MLA

Harrington, Oliver W. (Oliver Wendell), 1912-1995. "Awright Bootsie, ev'rybody else laughs at my jokes 'cept you. Wha's wrong you don't like cullud folks or som p'n?". Box 23 (Oversize). undated. https://collections.library.yale.edu/catalog/33076442.

APA, 6th edition

Harrington, Oliver W. (Oliver Wendell), 1912-1995. (["Box 23 (Oversize)"])(undated)["Awright Bootsie, ev'rybody else laughs at my jokes 'cept you. Wha's wrong you don't like cullud folks or som p'n?"]. https://collections.library.yale.edu/catalog/33076442.