Dyfyniad APA

Burchfield, J. D. (1975). Lord Kelvin and the age of the earth. Macmillan.

Dyfyniad Arddull Chicago

Burchfield, Joe D. Lord Kelvin and the Age of the Earth. London: Macmillan, 1975.

Dyfyniad MLA

Burchfield, Joe D. Lord Kelvin and the Age of the Earth. Macmillan, 1975.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.