MLA

Coffin, William Sloane, Jr., 1924-2006. Clippings. Box 44, folder 4. 1961-1978, undated. https://collections.library.yale.edu/catalog/10014417.

APA, 6th edition

Coffin, William Sloane, Jr., 1924-2006. (["Box 44, folder 4"])(1961-1978, undated)[Clippings]. https://collections.library.yale.edu/catalog/10014417.