MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Portraits with Charles August Lindbergh. Box 2, folder 23. Circa 1912. https://collections.library.yale.edu/catalog/10013981.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 2, folder 23"])(Circa 1912)[Portraits with Charles August Lindbergh]. https://collections.library.yale.edu/catalog/10013981.