Cite the government agency as the main author of the document--even if individual authors are named. This information should proceed all other information given in the reference field. Follow the government agency's name by a period and the publication year of the document in parenthesis.
Include the full name of the study or publication being cited--regardless how long the title is. This is particularly important when there are numerous publications that have similar titles. When citing the title of a publication in APA style, italicize the entire name.
Include the Superintendent of Documents call number after the publication title for in-print resources. For government agency information found on the web, include the date the information was retrieved and where it was found.
For example, information that was found on the Department of Agriculture's website on October 14, 2009 would read: "Retrieved on October 14, 2009 from the Department of Agriculture's website." The full web address of the cited material should follow the name of the government agency.