Description quoting MALT as a reference:

Thermodynamic database MALT group. Thermodynamic database MALT for Windows. Kagaku Gijutsu-Sha. 2005. (CD-ROM), 
available from <http://www.kagaku.com/malt/index.html>, (accessed 20xx-mm-dd).
Here 20xx-mm-dd should be the date the author actually accessed this web page.


If you need permanent description, use below.

H. Yokokawa, S. Yamauchi, and T. Matsumoto, “Thermodynamic Database MALT
for Windows with gem and CHD,” CALPHAD 26(2), 155-166 (2002).