Cite

Yes, that's right. Children are admitted free thanks to a generous gift from McDowell Armaments Co."

MLA

Harrington, Oliver W. (Oliver Wendell), 1912-1995. Yes, that's right. Children are admitted free thanks to a generous gift from McDowell Armaments Co.". Box 34 (Oversize). undated. https://collections.library.yale.edu/catalog/33076517.

APA, 6th edition

Harrington, Oliver W. (Oliver Wendell), 1912-1995. (["Box 34 (Oversize)"])(undated)[Yes, that's right. Children are admitted free thanks to a generous gift from McDowell Armaments Co."]. https://collections.library.yale.edu/catalog/33076517.