Yes not necessarily after every sentence especially if the sentences deal with the very same thing and this is a very long article Every paragraph should have one though If you look at the chapter Battle of Tampere for example the first three paragraphs have no citations but the last two have If its the case that that theyve simply been split up to smaller paragraphs we could use the same citation at several places with text    Im not criticizing the work done on this article Im just worried because I want to let it stay as FAclass I think part of the problem could be that the article might be getting too long For such a general presentation on the war not every section has to be very exact It makes citating harder and some of the chapters look really long which doesnt make them look too attractive to read As film directors say it is as important to decide what to leave out as it is important what to put in Do you think the article might have got too long on some parts