Francaviglia, R. V. (1991). Hard places: Reading the landscape of America's historic mining districts. University of Iowa Press.
Chicagoスタイル(17版)引用形式Francaviglia, Richard V. Hard Places: Reading the Landscape of America's Historic Mining Districts. Iowa City, Iowa: University of Iowa Press, 1991.
MLA(9版)引用形式Francaviglia, Richard V. Hard Places: Reading the Landscape of America's Historic Mining Districts. University of Iowa Press, 1991.
警告: この引用は必ずしも正確ではありません.