United States. Government Printing Office. (2011). Keeping America informed: The U.S. Government Printing Office : 150 years of service to the nation. United States Government Printing Office.
Dyfyniad Arddull ChicagoUnited States. Government Printing Office. Keeping America Informed: The U.S. Government Printing Office : 150 Years of Service to the Nation. [Washington, District of Columbia]: United States Government Printing Office, 2011.
Dyfyniad MLAUnited States. Government Printing Office. Keeping America Informed: The U.S. Government Printing Office : 150 Years of Service to the Nation. United States Government Printing Office, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.