Orton, H. D. (1871). Orton's lightning calculator, and accountant's assistant: The shortest, simplest, and most rapid method of computing numbers, adapted to every kind of business, and within the comprehension of every one having the slightest knowledge of figures (Entirely new edition, with extensive modifications and improvements..). Published by W.H. Sadler...
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOrton, Hoy D. Orton's Lightning Calculator, and Accountant's Assistant: The Shortest, Simplest, and Most Rapid Method of Computing Numbers, Adapted to Every Kind of Business, and Within the Comprehension of Every One Having the Slightest Knowledge of Figures. Entirely new edition, with extensive modifications and improvements.. Baltimore: Published by W.H. Sadler.., 1871.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOrton, Hoy D. Orton's Lightning Calculator, and Accountant's Assistant: The Shortest, Simplest, and Most Rapid Method of Computing Numbers, Adapted to Every Kind of Business, and Within the Comprehension of Every One Having the Slightest Knowledge of Figures. Entirely new edition, with extensive modifications and improvements.. Published by W.H. Sadler.., 1871.