Richard Addison McDonald
Enthalpy, heat capacity, and heat of fusion of aluminum from 366.degree. to 1647.degree.K
J. Chem. Eng. Data, 1967, 12 (1), pp 115–118
http://pubs.acs.org/doi/abs/10.1021/je60032a037
Thomas W. Chapman
The heat capacity of liquid metals,
Materials Science and Engineering, Volume 1, Issue 1, May 1966, Pages 65-69, ISSN 0025-5416, 10.1016/0025-5416(66)90012-7.
(http://www.sciencedirect.com/science/article/pii/0025541666900127)
One might be able to find the journal articles in the university library.