Cite

[Rear view of pack horse]. Y-1229

MLA

Blazer, Charlotte Pinkerton, McClintock, Walter, 1870-1949. [Rear view of pack horse]. Y-1229. Lantern slides box 12. undated. https://collections.library.yale.edu/catalog/2010816.

APA, 6th edition

Blazer, Charlotte Pinkerton, & McClintock, Walter, 1870-1949. (["Lantern slides box 12"])(undated)[[Rear view of pack horse]. Y-1229]. https://collections.library.yale.edu/catalog/2010816.