MLA

Schwarz, Louis, and publisher. New Orleans. Louis Schwarz, 0AD. https://collections.library.yale.edu/catalog/2015977.

APA, 6th edition

Schwarz, L., & publisher. (0 C.E.). New Orleans [Aerial views, Lithographs, Pictorial lettersheets]. Louis Schwarz. https://collections.library.yale.edu/catalog/2015977.