Cite

Looking down on Cataracts from lowest point reached by Major Powell party. The star is about at point the book stopped.

MLA

Johnson, L. H. Looking down on Cataracts from Lowest Point Reached by Major Powell Party. The Star Is about at Point the Book Stopped. 0AD. https://collections.library.yale.edu/catalog/2018228.

APA, 6th edition

Johnson, L. H. (0 C.E.). Looking down on Cataracts from lowest point reached by Major Powell party. The star is about at point the book stopped. [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2018228.