Cite

Joseph Henry to Peter Parker

MLA

Parker, Peter, 1804-1888. Joseph Henry to Peter Parker. 1876 January 20. https://collections.library.yale.edu/catalog/16808601.

APA, 6th edition

Parker, Peter, 1804-1888. (1876 January 20)[Joseph Henry to Peter Parker]. https://collections.library.yale.edu/catalog/16808601.