MLA

Wolff, Helen, 1906-1994. "Lou Andreas-Salomé," article, offprint. Box 75, folder 2154. 1972. https://collections.library.yale.edu/catalog/17269634.

APA, 6th edition

Wolff, Helen, 1906-1994. (["Box 75, folder 2154"])(1972)["Lou Andreas-Salomé," article, offprint]. https://collections.library.yale.edu/catalog/17269634.