Wikipedia:Tip of the day/December 27
The "perfect" Wikipedia article is built on solid research (remember to cite your sources). Contrary to popular belief, not all information is available for free on the Internet. Some research is only published in scientific journals and books (ask your library for remote lending services); some material is available only in commercial, password-protected electronic databases. If you have access to useful research material, please add the relevant information to Wikipedia:WikiProject Resource Exchange, a central portal to find Wikipedians with access to such resources. Remember we can only use facts from sources such as these, not a particular copyrighted expression thereof.
If you are a qualified user you can request access to the databases of paywalled resources proctored by The Wikipedia Library. Qualification usually involves having 500–1000 main namespace edits and 6–12 months tenure editing on Wikipedia.