MLA

Yale Peruvian Expedition ($d: 1911). Notebook. Box 19, folder 16. 1913 August. https://collections.library.yale.edu/catalog/33346599.

APA, 6th edition

Yale Peruvian Expedition ($d: 1911). (["Box 19, folder 16"])(1913 August)[Notebook]. https://collections.library.yale.edu/catalog/33346599.