Cite

Allegro: short score fragment

MLA

Koch, Frederick R. (Frederick Robinson). Allegro: short score fragment. Box 47, folder 946. n.d.. https://collections.library.yale.edu/catalog/2018737.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 47, folder 946"])(n.d.)[Allegro: short score fragment]. https://collections.library.yale.edu/catalog/2018737.