There is no definitive resource for government document citation. However, there are a variety of guides and resources on-line that can assist you with properly citing government documents. Also consult guidelines for the specific citation style you are using (e.g. APA, Chicago, MLA).
The online guides to citing U.S. government documents below are largely based on The Complete Guide to Citing Government Information Sources: A Manual for Writers & Librarians, by Diane L. Garner and Diane H. Smith.
Paper copies of the 1984 and 1993 editions are available at Howard-Tilton in the first floor stacks, call number Z 7164 .G7 G37.
Congressional (ProQuest) provides detailed information on citating resources that are retrieved from this database. Go to the following web site for specific information about how to create a bibliographic citation for a publication retrieved via Congressional.