MLA

Bainton, Roland H. (Roland Herbert), 1894-1984. Bacon, Leonard. 55, folder 806. undated. https://collections.library.yale.edu/catalog/33598971.

APA, 6th edition

Bainton, Roland H. (Roland Herbert), 1894-1984. (["55, folder 806"])(undated)[Bacon, Leonard]. https://collections.library.yale.edu/catalog/33598971.