wal-mart the high cost of low price 2005
I am trying to cite a movie resource in an MLA format report what to use?

the citation goes like this for the movie:
Wal-Mart: The High Cost of Low Price. Dir. Rober Greenwald. DVD. Bravenew Films, 2005.
I was wondering for in text citation would you use the title of the movie or (Greenwald) after stating a fact from the movie. This is in MLA format

(Greenwald, 2005)