Cite

Puccini, Elvira (to Erminia Magrini)

MLA

Koch, Frederick R. (Frederick Robinson). Puccini, Elvira (to Erminia Magrini). Box 50, folder 1053. 1928 Jul 31. https://collections.library.yale.edu/catalog/16101626.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 50, folder 1053"])(1928 Jul 31)[Puccini, Elvira (to Erminia Magrini)]. https://collections.library.yale.edu/catalog/16101626.