South entrance to San Fernando tunnel, S.P.R.R
MLA
South Entrance to San Fernando Tunnel, S.P.R.R. 0AD. https://collections.library.yale.edu/catalog/2013684.
APA, 6th edition
South entrance to San Fernando tunnel, S.P.R.R. (0 C.E.). [Albumen prints, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2013684.