Evans, W. S. (2010). Accounting book-keeping machines and calculators of the 20th century. ABC Bookman.
Chicago-Zitierstil (17. Ausg.)Evans, William S. Accounting Book-keeping Machines and Calculators of the 20th Century. London: ABC Bookman, 2010.
MLA-Zitierstil (9. Ausg.)Evans, William S. Accounting Book-keeping Machines and Calculators of the 20th Century. ABC Bookman, 2010.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.