Haugen, D. M., & Musser, S. (2007). Is global warming a threat? Thomson/Gale/Greenhaven Press.
Lua i Stíl Chicago (17ú heag.)Haugen, David M., agus Susan Musser. Is Global Warming a Threat? Detroit: Thomson/Gale/Greenhaven Press, 2007.
Lua MLA (8ú heag.)Haugen, David M., agus Susan Musser. Is Global Warming a Threat? Thomson/Gale/Greenhaven Press, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.