Lua APA (7ú heag.)

Usher , A. P. (1929). A history of mechanical inventions. McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

Usher , Abbott Payson. A History of Mechanical Inventions. New York: McGraw-Hill, 1929.

Lua MLA (9ú heag.)

Usher , Abbott Payson. A History of Mechanical Inventions. McGraw-Hill, 1929.

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