Dyfyniad APA

(1976). The Mid-atlantic States. National Geographic Society.

Dyfyniad Arddull Chicago

The Mid-atlantic States. Washington, DC: National Geographic Society, 1976.

Dyfyniad MLA

The Mid-atlantic States. National Geographic Society, 1976.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.