APA (7th ed.) Citation

Booth, A. D., & Booth, K. H. (1956). Automatic digital calculators (2. ed.). Butterworths.

Chicago Style (17th ed.) Citation

Booth, Andrew D., and Kathleen H. Booth. Automatic Digital Calculators. 2. ed. London: Butterworths, 1956.

MLA (9th ed.) Citation

Booth, Andrew D., and Kathleen H. Booth. Automatic Digital Calculators. 2. ed. Butterworths, 1956.