MLA

Schenkar, Joan, and collector. Joan Schenkar Collection of Natalie Barney, 1935-1973. 0AD. https://collections.library.yale.edu/catalog/31920663.

APA, 6th edition

Schenkar, J., & collector. (0 C.E.). Joan Schenkar collection of Natalie Barney, 1935-1973 [Portraits, Address books, Bookmarks, Cartes-de-visite (card photographs), Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/31920663.