MLA

Cox, Christopher, 1949-1990. Olander, William. Box 5, folder 113. 1987. https://collections.library.yale.edu/catalog/10171004.

APA, 6th edition

Cox, Christopher, 1949-1990. (["Box 5, folder 113"])(1987)[Olander, William]. https://collections.library.yale.edu/catalog/10171004.