MLA

Postcard Album [of Edith Wharton's Travels throughout Europe]. 0AD. https://collections.library.yale.edu/catalog/2064363.

APA, 6th edition

Postcard album [of Edith Wharton's travels throughout Europe]. (0 C.E.). [Albums, Correspondence, Group portraits, Illustrations, Intaglio prints, Lithographs, Photographic postcards, Photographic prints, Photographs, Photomechani]. https://collections.library.yale.edu/catalog/2064363.