LS, Weimar
MLA
Speck, William A. (William Alfred), 1864-1928. LS, Weimar. Box 9, folder 267. 1782 Feb 20. https://collections.library.yale.edu/catalog/2005297.
APA, 6th edition
Speck, William A. (William Alfred), 1864-1928. (["Box 9, folder 267"])(1782 Feb 20)[LS, Weimar]. https://collections.library.yale.edu/catalog/2005297.