In an essay presented at an Asian Studies conference held at Duke University, Sheldon Garon analyzes the relation of state, labor-unions, and small businesses in Japan between the 1950s and 1980s
If you have already introduced the author and work from which you are citing, and you are obviously referring to the same work, you probably don’t need to mention them again. 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.