MLA

Draper, Muriel, 1886-1952. Invitations. Box 16, folder 527. 1881-1952, n.d.. https://collections.library.yale.edu/catalog/2003247.

APA, 6th edition

Draper, Muriel, 1886-1952. (["Box 16, folder 527"])(1881-1952, n.d.)[Invitations]. https://collections.library.yale.edu/catalog/2003247.