MLA

Lmanian, Alexander, 1925-1996. Washington Monument. Box 1, folder 72. 1968 April 2. https://collections.library.yale.edu/catalog/2042944.

APA, 6th edition

Lmanian, Alexander, 1925-1996. (["Box 1, folder 72"])(1968 April 2)[Washington Monument]. https://collections.library.yale.edu/catalog/2042944.