MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Bowlus glider tests. Box 10, folder 8. 1930 January-March. https://collections.library.yale.edu/catalog/10013256.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 10, folder 8"])(1930 January-March)[Bowlus glider tests]. https://collections.library.yale.edu/catalog/10013256.