Booth, A. D. (1965). Automatic digital calculators (3rd ed.). Butterworth.
Lua i Stíl Chicago (17ú heag.)Booth, Andrew D. Automatic Digital Calculators. 3rd ed. London: Butterworth, 1965.
Lua MLA (9ú heag.)Booth, Andrew D. Automatic Digital Calculators. 3rd ed. Butterworth, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.