MLA

Gascoyne, David, 1916-2001. Court of Protection, chief clerk. Box 10, folder 178. 1969 Dec 19. https://collections.library.yale.edu/catalog/2055498.

APA, 6th edition

Gascoyne, David, 1916-2001. (["Box 10, folder 178"])(1969 Dec 19)[Court of Protection, chief clerk]. https://collections.library.yale.edu/catalog/2055498.