APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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