MLA

Acton, Harold, 1904-1994. Prologue. Box 1, folder 73-74. 1933 1941. https://collections.library.yale.edu/catalog/16604545.

APA, 6th edition

Acton, Harold, 1904-1994. (["Box 1, folder 73-74"])(1933 1941)[Prologue]. https://collections.library.yale.edu/catalog/16604545.