MLA

Wilfred, Thomas, 1889-1968. Projectors. Box 10, folder 146. Undated. https://collections.library.yale.edu/catalog/10019421.

APA, 6th edition

Wilfred, Thomas, 1889-1968. (["Box 10, folder 146"])(Undated)[Projectors]. https://collections.library.yale.edu/catalog/10019421.