MLA

Salsbury, Nathan, 1846-1902. Invitations and tickets. Box 1, folder 23. 1892-1900, n.d.. https://collections.library.yale.edu/catalog/2005993.

APA, 6th edition

Salsbury, Nathan, 1846-1902. (["Box 1, folder 23"])(1892-1900, n.d.)[Invitations and tickets]. https://collections.library.yale.edu/catalog/2005993.