Ullman, J. R. (1924). Americans on Everest: The official account of the ascent by Norman G Dyhren Gurth. J. B. Lippincott.
Citazione stile Chigago Style (17a edizione)Ullman, James Ramsey. Americans on Everest: The Official Account of the Ascent by Norman G Dyhren Gurth. Philadelphia: J. B. Lippincott, 1924.
Citatione MLA (9a ed.)Ullman, James Ramsey. Americans on Everest: The Official Account of the Ascent by Norman G Dyhren Gurth. J. B. Lippincott, 1924.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.