Group, 1931 June
MLA
Lindbergh, Charles A. (Charles Augustus), 1902-1974. Group, 1931 June. Box 23, folder 2. 1931 June. https://collections.library.yale.edu/catalog/10011557.
APA, 6th edition
Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 23, folder 2"])(1931 June)[Group, 1931 June]. https://collections.library.yale.edu/catalog/10011557.