MLA

Lmanian, Alexander, 1925-1996. Potomac River. Box 1, folder 7. 1968 April 28. https://collections.library.yale.edu/catalog/2042879.

APA, 6th edition

Lmanian, Alexander, 1925-1996. (["Box 1, folder 7"])(1968 April 28)[Potomac River]. https://collections.library.yale.edu/catalog/2042879.