MLA

Schieffelin, Jacob, 1793-1880. Correspondence. Box 3, folder 38. 1829. https://collections.library.yale.edu/catalog/16706049.

APA, 6th edition

Schieffelin, Jacob, 1793-1880. (["Box 3, folder 38"])(1829)[Correspondence]. https://collections.library.yale.edu/catalog/16706049.