MLA

Douglas, Norman, 1868-1952. Old Calabria Letters. Box 45. 1904-1929. https://collections.library.yale.edu/catalog/16454750.

APA, 6th edition

Douglas, Norman, 1868-1952. (["Box 45"])(1904-1929)[Old Calabria Letters]. https://collections.library.yale.edu/catalog/16454750.