MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Portraits. Box 21, folder 1-4. Circa 1918-1929. https://collections.library.yale.edu/catalog/10015316.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 21, folder 1-4"])(Circa 1918-1929)[Portraits]. https://collections.library.yale.edu/catalog/10015316.