MLA

Albers, Josef, 1888-1976. Articles and interviews by Albers. Box 25, folder 237-249. 1963-1969, undated. https://collections.library.yale.edu/catalog/10011725.

APA, 6th edition

Albers, Josef, 1888-1976. (["Box 25, folder 237-249"])(1963-1969, undated)[Articles and interviews by Albers]. https://collections.library.yale.edu/catalog/10011725.