Usher , A. P. (1929). A history of mechanical inventions. McGraw-Hill.
Chicago-čujuhus (17. p.)Usher , Abbott Payson. A History of Mechanical Inventions. New York: McGraw-Hill, 1929.
MLA-čujuhus (9. p.)Usher , Abbott Payson. A History of Mechanical Inventions. McGraw-Hill, 1929.
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