MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. In Holsteinsborg, Greenland. Box 13, folder 1. 1933 July 26-August 4. https://collections.library.yale.edu/catalog/10016297.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 13, folder 1"])(1933 July 26-August 4)[In Holsteinsborg, Greenland]. https://collections.library.yale.edu/catalog/10016297.