Cita APA (7th ed.)
Gupta, H. K., & Roy, S. (2007). Geothermal energy: An alternative resource for the 21st century. Elsevier.
Cita Chicago (17th ed.)
Gupta, Harsh K., i Sukanta Roy. Geothermal Energy: An Alternative Resource for the 21st Century. Amsterdam, The Netherlands ; Boston: Elsevier, 2007.
Cita MLA (9th ed.)
Gupta, Harsh K., i Sukanta Roy. Geothermal Energy: An Alternative Resource for the 21st Century. Elsevier, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.