The best distance between the material and the citation is a matter of judgment. If a word or phrase is particularly contentious, an inline citation may be added next to it within a sentence, but adding the citation to the end of the sentence or paragraph is usually sufficient. Editors should exercise caution when adding to or rearranging material to ensure that text-source relationships are maintained.
==Inline citations and article classes==
There is no specified amount of inline citation that an article must have before being eligible for nomination as a Featured Article, Good Article, or (when applicable) A-Class article, and no particular style is favored over any other. The best advice is on the FAC page: an article should be tightly written and comprehensive. If one inline citation is all it takes to make it tightly written that's ok; if you need 100 inline citations that's ok too.