Cite

Learning to fly Bird biplane

MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Learning to fly Bird biplane. Box 10, folder 21. 1931. https://collections.library.yale.edu/catalog/10013259.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 10, folder 21"])(1931)[Learning to fly Bird biplane]. https://collections.library.yale.edu/catalog/10013259.