MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Outgoing, 1970 November-1974 June. Box 43, folder 1307-1334. 1970 November-1974 June. https://collections.library.yale.edu/catalog/10014022.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 43, folder 1307-1334"])(1970 November-1974 June)[Outgoing, 1970 November-1974 June]. https://collections.library.yale.edu/catalog/10014022.