In writing, we should insert reference marks of the authors and the reference to show that we do not remove the words or ideas of the author's speech or opinion of ourselves.
We should put in writing, citing the words of the author and reference to show that we do not have the words or the opinions of the author became a speech or opinion of ourselves.
In writing, we should put the quotations of reference author and references to show that we are not words or opinions of the author become words or the opinion of ourselves.