MLA

Brainard, Joe, 1942-1994, Schuyler, James. [Correspondence : James Schuyler to Joe Brainard]. Box 5 | Folder: Correspondence "James Schuyler to Joe Brainard" [1 of 6] 1964-1990. 1964-67, undated. https://collections.library.yale.edu/catalog/10268319.

APA, 6th edition

Brainard, Joe, 1942-1994, & Schuyler, James. (["Box 5 | Folder: Correspondence \"James Schuyler to Joe Brainard\" [1 of 6] 1964-1990"])(1964-67, undated)[[Correspondence : James Schuyler to Joe Brainard]]. https://collections.library.yale.edu/catalog/10268319.