MLA

Koch, Frederick R. (Frederick Robinson). Other Papers/Album of drawings relating to Mendelssohn-Bartholdy's tour of Scotland in 1829. Box 83, folder 1425. [1846 or 1847]. https://collections.library.yale.edu/catalog/2002373.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 83, folder 1425"])([1846 or 1847])[Other Papers/Album of drawings relating to Mendelssohn-Bartholdy's tour of Scotland in 1829]. https://collections.library.yale.edu/catalog/2002373.