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1892 T. O'C. Sloane Standard Electr. Dict. (1893) 317 Kilojoule.

1938 Jrnl. Royal Aeronaut. Soc. 42 885 Formation of frost on the wing is accompanied by a rise in temperature which raises the deposit to 0°C. A curve is given showing the energy in kilojoules necessary to remove ice.

1974 Times 20 Feb. 12 Each of the colourfully illustrated cards shows a different food, together with its value in carbohydrate, calories and kilo-joules (the measurement that will be used instead of calories when Britain goes metric).