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John Muir (1997). “Nature Writings: The Story of My Boyhood and Youth, My First Summer in the Sierra, the Mountains of California, Stickeen, Selected Essays”, p.364, Library of America
John Muir (2015). “THE YOSEMITE COLLECTION of John Muir (Illustrated): The Yosemite, Our National Parks, Features of the Proposed Yosemite National Park, A Rival of the Yosemite, The Treasures of the Yosemite, Yosemite Glaciers, Yosemite in Winter & Yosemite in Spring”, p.188, e-artnow