[Envelope addressed to] Mr. James T. Babb, 1956 July 28, New Haven
MLA
[Envelope Addressed to] Mr. James T. Babb, 1956 July 28, New Haven. 1956. https://collections.library.yale.edu/catalog/9998483.
APA, 6th edition
[Envelope addressed to] Mr. James T. Babb, 1956 July 28, New Haven. (1956). [Envelopes]. https://collections.library.yale.edu/catalog/9998483.