Burchfield, J. D. (1975). Lord Kelvin and the age of the earth. Science History Publications.
Lua i Stíl Chicago (17ú heag.)Burchfield, Joe D. Lord Kelvin and the Age of the Earth. New York: Science History Publications, 1975.
Lua MLA (9ú heag.)Burchfield, Joe D. Lord Kelvin and the Age of the Earth. Science History Publications, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.