Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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