Cite

Clark, Claude, to Pauline [Schletter]

MLA

Schletter, Annie, 1858-1944. Clark, Claude, to Pauline [Schletter]. Box 1, folder 38. n.d.. https://collections.library.yale.edu/catalog/17453747.

APA, 6th edition

Schletter, Annie, 1858-1944. (["Box 1, folder 38"])(n.d.)[Clark, Claude, to Pauline [Schletter]]. https://collections.library.yale.edu/catalog/17453747.