MLA

Tellefsen, Lisbet, 1961-. Aché journal committee. Box 2, folder 87. undated. https://collections.library.yale.edu/catalog/32336883.

APA, 6th edition

Tellefsen, Lisbet, 1961-. (["Box 2, folder 87"])(undated)[Aché journal committee]. https://collections.library.yale.edu/catalog/32336883.