MLA

Yale Peruvian Expedition ($d: 1911). 1914. Box 15, folder 247-252. 1914. https://collections.library.yale.edu/catalog/33226022.

APA, 6th edition

Yale Peruvian Expedition ($d: 1911). (["Box 15, folder 247-252"])(1914)[1914]. https://collections.library.yale.edu/catalog/33226022.