Grammar, Usage / MLA Style - Quoting Quotes in Documents / Comparative Essays? [12]

Quoting quotes - how do I correctly cite a citation?

I am studying Film theory right now and most of the work is based on prior work from other writers. I am finding most of the definitions I need are quotes and I have no idea how to quote them properly if there is even a way. What I have done in the past is just go directly to the source but now I am finding that some of the time I am crunching for time. If there is a way, how do I correctly cite a citation?