Cite

Letter from Igor Sikorsky to Anne Morrow Lindbergh.

MLA

Skiorsky, I. I. Letter from Igor Sikorsky to Anne Morrow Lindbergh. 1946. https://collections.library.yale.edu/catalog/10016150.

APA, 6th edition

Skiorsky, I. I. (1946). Letter from Igor Sikorsky to Anne Morrow Lindbergh. [Paper]. https://collections.library.yale.edu/catalog/10016150.