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).
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.