MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Clubb, Baltimore. Box 33, folder 7. Circa 1850. https://collections.library.yale.edu/catalog/10615473.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 33, folder 7"])(Circa 1850)[Clubb, Baltimore]. https://collections.library.yale.edu/catalog/10615473.