Ullman, J. R. (1924). Americans on Everest: The official account of the ascent by Norman G Dyhren Gurth. J. B. Lippincott.
Chicago-čujuhus (17. p.)Ullman, James Ramsey. Americans on Everest: The Official Account of the Ascent by Norman G Dyhren Gurth. Philadelphia: J. B. Lippincott, 1924.
MLA-čujuhus (9. p.)Ullman, James Ramsey. Americans on Everest: The Official Account of the Ascent by Norman G Dyhren Gurth. J. B. Lippincott, 1924.
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