APA (7th ed.) Citation

Sharp, C. H. (1926). Concepts, units and measurements of illuminating engineering twenty years ago and today. Transactions of the Illuminating Engineering Society, 21, 1085.

Chicago Style (17th ed.) Citation

Sharp, C. H. "Concepts, Units and Measurements of Illuminating Engineering Twenty Years Ago and Today." Transactions of the Illuminating Engineering Society 21 (1926): 1085.

MLA (9th ed.) Citation

Sharp, C. H. "Concepts, Units and Measurements of Illuminating Engineering Twenty Years Ago and Today." Transactions of the Illuminating Engineering Society, vol. 21, 1926, p. 1085.