Cummings, B. (1910). The great natural bridges of Utah. University of Utah.
Lua i Stíl Chicago (17ú heag.)Cummings, Byron. The Great Natural Bridges of Utah. [Salt Lake City]: University of Utah, 1910.
Lua MLA (8ú heag.)Cummings, Byron. The Great Natural Bridges of Utah. University of Utah, 1910.
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