APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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