Francaviglia, R. V. (1991). Hard places: Reading the landscape of America's historic mining districts. University of Iowa Press.
Chicago-referens (17:e uppl.)Francaviglia, Richard V. Hard Places: Reading the Landscape of America's Historic Mining Districts. Iowa City, Iowa: University of Iowa Press, 1991.
MLA-referens (9:e uppl.)Francaviglia, Richard V. Hard Places: Reading the Landscape of America's Historic Mining Districts. University of Iowa Press, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.