Argument and coherence as necessary as references. It's a complete package. In fact, an essay not referenced isn't an essay rather a story. What took us too long too understand was that essays in CSS are related to different disciplines so rules developed by those disciplines need to be entertained.

Good arguments are not all ours we read them somewhere, add our own analyse things and its unethical to not acknowledge the original thinker. Again we need fscts and figures too that too are from some sources. So we have to mention those. Basically we have to qualify what we are saying that's the essence of an essay