MLA

Cortissoz, Royal, 1869-1948. Galantiere, Lewis. Box 6, folder 217. 1932-42. https://collections.library.yale.edu/catalog/17197462.

APA, 6th edition

Cortissoz, Royal, 1869-1948. (["Box 6, folder 217"])(1932-42)[Galantiere, Lewis]. https://collections.library.yale.edu/catalog/17197462.