For example, the following sentence puts information about the author and work before the quotation: Milan Kundera, in his book The Art of the Novel, suggests that “if the novel should really disappear, it will do so not because it has exhausted its powers but because it exists in a world grown alien to it.” You may also want to describe the author(s) if they are not famous, or if you have reason to believe your reader does not know them.You should say whether they are economic analysts, artists, physicists, etc.However, if you have cited other sources and then go back to one you had cited earlier, it is a good idea to mention at least the author's name again (and the work if you have referred to more than one by this author) to avoid confusion.
First, you have to think about how you want to identify your sources.
If your sources are very important to your ideas, you should mention the author and work in a sentence that introduces your citation.
If the source is central to your work, you may want to introduce it in a separate sentence or two, summarizing its importance and main ideas.
But often you can just tag this information onto the beginning or end of a sentence.
Sometimes, however, you will need to modify the words or format of the quotation in order to fit in your paper.