MLA

Bainton, Roland H. (Roland Herbert), 1894-1984. Adams, Harry. 55, folder 800. undated. https://collections.library.yale.edu/catalog/33591426.

APA, 6th edition

Bainton, Roland H. (Roland Herbert), 1894-1984. (["55, folder 800"])(undated)[Adams, Harry]. https://collections.library.yale.edu/catalog/33591426.