MLA

Harrington, Oliver W. (Oliver Wendell), 1912-1995. Gunsmoke!. Box 14 (Oversize). undated. https://collections.library.yale.edu/catalog/33075453.

APA, 6th edition

Harrington, Oliver W. (Oliver Wendell), 1912-1995. (["Box 14 (Oversize)"])(undated)[Gunsmoke!]. https://collections.library.yale.edu/catalog/33075453.