Papers and printed poems
MLA
Wolff, Kurt, 1887-1963. Papers and printed poems. Box 10, folder 406-07. 1912-17, n.d.. https://collections.library.yale.edu/catalog/10625560.
APA, 6th edition
Wolff, Kurt, 1887-1963. (["Box 10, folder 406-07"])(1912-17, n.d.)[Papers and printed poems]. https://collections.library.yale.edu/catalog/10625560.