Dyfyniad APA

Haugen, D. M., & Musser, S. (2007). Is global warming a threat? Thomson/Gale/Greenhaven Press.

Dyfyniad Arddull Chicago

Haugen, David M., and Susan Musser. Is Global Warming a Threat? Detroit: Thomson/Gale/Greenhaven Press, 2007.

Dyfyniad MLA

Haugen, David M., and Susan Musser. Is Global Warming a Threat? Thomson/Gale/Greenhaven Press, 2007.

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