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, gThermodynamic Database MALT
for Windows with gem and CHD,h CALPHAD 26(2), 155-166 (2002).