APA (7th ed.) Citation

Fowler, J. M., & Fowler, K. (1977). Geothermal energy. [Dept. of Energy].

Chicago Style (17th ed.) Citation

Fowler, John M., and Kathryn Fowler. Geothermal Energy. [Washington]: [Dept. of Energy], 1977.

MLA (9th ed.) Citation

Fowler, John M., and Kathryn Fowler. Geothermal Energy. [Dept. of Energy], 1977.