[dragonwriter]

If the fact is in the source cited, primary sources are okay as direct sources. If it is an analytical interpretation of the source (such as most fact claims about the source or its contents, rather than fact claims made directly in the source), then that interpretation needs sourced from somewhere.

[oopsallmagic]

Somewhere that isn't the person updating the article, that is. The trick is to make a random website that does the same, and then it's totally fine!