National Flag Foundation. Flag Plaza standard: A triannual publication of the National Flag Foundation. National Flag Foundation.
Chicago-Zitierstil (17. Ausg.)National Flag Foundation. Flag Plaza Standard: A Triannual Publication of the National Flag Foundation. Pittsburgh, Pa.: National Flag Foundation.
MLA-Zitierstil (8. Ausg.)National Flag Foundation. Flag Plaza Standard: A Triannual Publication of the National Flag Foundation. National Flag Foundation.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.