Then the other source materials is journal,
journal is academic magazine or newspaper that contain articles that writer based
on research and analysis. Journal also
more reliable and more factual document and information.
There are several ways to find source materials that can help you to find more information and data. this is very helpful to to solve your work or project and what is important you should know where you get this source as a reference to avoid you from plagiarisms. that all from me.
for more information:
http://www.uvic.ca/library/research/tips/journal/index.php
http://www.ala.org/rusa/sections/history/resources/pubs/usingprimarysources