MLA

Yale Peruvian Expedition ($d: 1911). May - November 30. Box 7, folder 55-73. May - November 30. https://collections.library.yale.edu/catalog/33511051.

APA, 6th edition

Yale Peruvian Expedition ($d: 1911). (["Box 7, folder 55-73"])(May - November 30)[May - November 30]. https://collections.library.yale.edu/catalog/33511051.