Gray, A. (1921). Absolute measurements in electricity and magnetism (2nd edition.). Macmillan.
Lua i Stíl Chicago (17ú heag.)Gray, Andrew. Absolute Measurements in Electricity and Magnetism. 2nd edition. London: Macmillan, 1921.
Lua MLA (9ú heag.)Gray, Andrew. Absolute Measurements in Electricity and Magnetism. 2nd edition. Macmillan, 1921.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.