Usher , A. P. (1929). A history of mechanical inventions. McGraw-Hill.
Chicago Style (17. basım) AtıfUsher , Abbott Payson. A History of Mechanical Inventions. New York: McGraw-Hill, 1929.
MLA (9th ed.) AtıfUsher , Abbott Payson. A History of Mechanical Inventions. McGraw-Hill, 1929.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..