[On photography]
MLA
Cox, Christopher, 1949-1990. [On photography]. Box 43, folder 668. undated. https://collections.library.yale.edu/catalog/17167793.
APA, 6th edition
Cox, Christopher, 1949-1990. (["Box 43, folder 668"])(undated)[[On photography]]. https://collections.library.yale.edu/catalog/17167793.