MLA

Speck, William A. (William Alfred), 1864-1928. AL (draft, incomplete) : Weimar, to Leopoldine Grustner von Grusdorf. Box 9, folder 278. 1827 Mar 30. https://collections.library.yale.edu/catalog/2005308.

APA, 6th edition

Speck, William A. (William Alfred), 1864-1928. (["Box 9, folder 278"])(1827 Mar 30)[AL (draft, incomplete) : Weimar, to Leopoldine Grustner von Grusdorf]. https://collections.library.yale.edu/catalog/2005308.