National Flag Foundation. Flag Plaza standard: A triannual publication of the National Flag Foundation. National Flag Foundation.
Cita Chicago (17th ed.)National Flag Foundation. Flag Plaza Standard: A Triannual Publication of the National Flag Foundation. Pittsburgh, Pa.: National Flag Foundation.
Cita MLA (8th ed.)National Flag Foundation. Flag Plaza Standard: A Triannual Publication of the National Flag Foundation. National Flag Foundation.
Atenció: Aquestes cites poden no estar 100% correctes.