Well, it all depends on what kind of work you are citing. Generally you put the page or line number in parentheses after the quote. If you are only working with one quote then you can probably get away with just the page number. For example: “…It all depends on what kind of work you are citing.” (1). If you have multiple sources, you include the authors last name. I.e.: “…you put the page or line number in parentheses…” (Ashworth 1). If you don’t know the authors name, subsitute the title instead. If you are using an indirect source, film, poem or play…Well, I’d just consult a reference book for that. I’ve found “A Writer’s Reference” by Diana Hacker, is fairly comprehensive. This, or a book like it should be readily available at any library.