Dyfyniad APA

(2004). National geographic: Chasing tornadoes a tale of science guts, and luck. Washington, DC: National Geographic Society.

Dyfyniad Arddull Chicago

National Geographic: Chasing Tornadoes a Tale of Science Guts, and Luck. Washington, DC: National Geographic Society, 2004.

Dyfyniad MLA

National Geographic: Chasing Tornadoes a Tale of Science Guts, and Luck. Washington, DC: National Geographic Society, 2004.

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