APA (7th ed.) Citation

George, R., & Gray-Hann, P. (2001). NREL North American solar radiation atlas. National Renewable Energy Laboratory.

Chicago Style (17th ed.) Citation

George, Ray, and Pamela Gray-Hann. NREL North American Solar Radiation Atlas. [Golden, Colo.]: National Renewable Energy Laboratory, 2001.

MLA (9th ed.) Citation

George, Ray, and Pamela Gray-Hann. NREL North American Solar Radiation Atlas. National Renewable Energy Laboratory, 2001.