It is normal to have 3 to 6 reference tags per page. If there are many quotations, the source can be omitted. But if you paste it, you must change 2 to 3 words for every 15 word. It's best not to be long. Take more time to change. Take it easy. As long as you copy and paste a short paragraph, and the format is formal, and the structure of the paper is your own creation, you will definitely not only copy the marked points, but generally will not brush them.