MLA

Schletter, Annie, 1858-1944. Her Majesty's Jubilee Thanksgiving Service, prayer and invitation for Percy Schletter. Box 2, folder 81. 1887 Jun 21. https://collections.library.yale.edu/catalog/17453752.

APA, 6th edition

Schletter, Annie, 1858-1944. (["Box 2, folder 81"])(1887 Jun 21)[Her Majesty's Jubilee Thanksgiving Service, prayer and invitation for Percy Schletter]. https://collections.library.yale.edu/catalog/17453752.