MLA

Grenfell, Wilfred Thomason, Sir, 1865-1940. "Liv'eres". Box 41, folder 12. 1855-1958, undated. https://collections.library.yale.edu/catalog/10009133.

APA, 6th edition

Grenfell, Wilfred Thomason, Sir, 1865-1940. (["Box 41, folder 12"])(1855-1958, undated)["Liv'eres"]. https://collections.library.yale.edu/catalog/10009133.