Usher , A. P. (1929). A history of mechanical inventions. McGraw-Hill.
Čikaški stil citiranja (17. izdanje)Usher , Abbott Payson. A History of Mechanical Inventions. New York: McGraw-Hill, 1929.
MLA način citiranja (9. izdanje)Usher , Abbott Payson. A History of Mechanical Inventions. McGraw-Hill, 1929.
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