Add an in-text citation using MLA format.
Theroux points out that visiting a once-great city that is now in ruins gives "perspective" on "human effort"
Source: Riding the Iron Rooster by Paul Theroux, page 199. Published by Mariner Books, New York 1988:
Nothing puts human effort into better perspective than a ruined city. "This was once a great capital," people say, pointing to the fallen walls and broken streets and dust.