APA Citation

(1977). Specification for calculators and adding machines: Part 1. Numeric section of ten-key keyboards for calculators and adding machines. London: BSI.

Chicago Style Citation

Specification for Calculators and Adding Machines: Part 1. Numeric Section of Ten-key Keyboards for Calculators and Adding Machines. London: BSI, 1977.

MLA Citation

Specification for Calculators and Adding Machines: Part 1. Numeric Section of Ten-key Keyboards for Calculators and Adding Machines. London: BSI, 1977.

Warning: These citations may not always be 100% accurate.