MLA

Macdonald, A. J., -1854. Brook Farm Phalanx (West Roxbury, Massachusetts), 1841. Box 1, folder 3. 1844–1854. https://collections.library.yale.edu/catalog/2026505.

APA, 6th edition

Macdonald, A. J., -1854. (["Box 1, folder 3"])(1844–1854)[Brook Farm Phalanx (West Roxbury, Massachusetts), 1841]. https://collections.library.yale.edu/catalog/2026505.