# When (if ever) should a question include general reference links?

I asked a question in which I provided a link to Wikipedia for a term that seemed likely to be unfamiliar to many here, but now I am wondering if such was appropriate/helpful. (If I had not provided the link, I would have slightly reworded the phrase to make a web search more effective. The term was also only of secondary importance.) I am also curious about when questions should include links to general reference materials.

(Specialized reference links seem to be easier to evaluate for usefulness. Links in answers also seem to be easier to evaluate.)