APA (7th ed.) Citation

Gupta, H. K., & Roy, S. (2008). Geothermal energy: An alternative resource for the 21st century (Reprint.). Elsevier.

Chicago Style (17th ed.) Citation

Gupta, Harsh K., and Sukanta Roy. Geothermal Energy: An Alternative Resource for the 21st Century. Reprint. Amsterdam [u.a.]: Elsevier, 2008.

MLA (9th ed.) Citation

Gupta, Harsh K., and Sukanta Roy. Geothermal Energy: An Alternative Resource for the 21st Century. Reprint. Elsevier, 2008.