Citing government documents can be tricky because they aren't like any other kind of information you cite for a paper. Each kind of document -- court proceeding, congressional bill, supreme court decision -- requires different treatment according to the style you are working with. That doesn't mean you should be swayed from using this rich source of information! According to its strategic plan, the Government Publishing Office seeks to "keep American informed" and you are a part that.
When citing government documents, you follow the style guide you are currently using....but with the caveats of citing government documents. Don't worry, there are guides to help you get it right.
The Center for Writing and Communication, housed on the first floor of McWherter Library, offers free, individual consultations with a trained staff. Get feedback on your writing and speaking assignments at any stage in the process - up to and especially citation.