MLA

Clerc, Laurent, 1785-1869. [New York and Boston Youth's Cabinet ]: "American Asylum for the Deaf and Dumb of Hartford, Ct.". 1, folder 15. 1840 September 10. https://collections.library.yale.edu/catalog/33393315.

APA, 6th edition

Clerc, Laurent, 1785-1869. (["1, folder 15"])(1840 September 10)[[New York and Boston Youth's Cabinet ]: "American Asylum for the Deaf and Dumb of Hartford, Ct."]. https://collections.library.yale.edu/catalog/33393315.