MLA

Flores Perez, P. No 58. Efectos Del Bombardeo. 1914. https://collections.library.yale.edu/catalog/2015336.

APA, 6th edition

Flores Perez, P. (1914). No 58. Efectos del bombardeo [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2015336.