Francaviglia, R. V. (1991). Hard places: Reading the landscape of America's historic mining districts. University of Iowa Press.
芝加哥风格引文Francaviglia, Richard V. Hard Places: Reading the Landscape of America's Historic Mining Districts. Iowa City, Iowa: University of Iowa Press, 1991.
MLA引文Francaviglia, Richard V. Hard Places: Reading the Landscape of America's Historic Mining Districts. University of Iowa Press, 1991.
警告：这些引文格式不一定是100％准确.