<human>: Provide a brief overview of the text.

EDIT: After some more searching, I found an official source on the same information that I am able to cite. However, feel free to still weigh in on the topic, for my own future reference, as well for others who happen to read this and be wondering the same thing.

I am writing a paper on internet censorship in the People's Republic of China. Obviously, I cannot cite Wikipedia as a source. I am not using it as a primary source of information. Rather, I am using it to find basic facts about the topic, that I am then researching further and elaborating on (using much more official sources). However, there are several "facts" on the Wikipedia page that I cannot find elsewhere on the internet. The source listed for these facts is also not available online.

So my question is, do I cite the source listed by Wikipedia? I have frequently heard from teachers that information on Wikipedia constitutes "common knowledge" and therefor does not need to be cited. Should I do that? Or just leave out this piece of information all together?

My biggest concern is that my teacher will be upset that this specific piece of information is not cited, or will check basic resources on the topic and call it plagiarism.

Note: The information is in quotes, which is why I am considering citing the original source listed by Wikipedia. Currently, I do not have it in quotes, but could possibly replace my writing with the quoted paragraph, and cite the original source.
<bot>: I am writing a paper, and have included info from Wikipedia. Does this count as plagiarism, if not cited? (No direct copying of words involved, but the ideas are the exact same).