MLA

Bainton, Roland H. (Roland Herbert), 1894-1984. Walker, Williston. 56, folder 906. undated. https://collections.library.yale.edu/catalog/33599315.

APA, 6th edition

Bainton, Roland H. (Roland Herbert), 1894-1984. (["56, folder 906"])(undated)[Walker, Williston]. https://collections.library.yale.edu/catalog/33599315.