APA استشهاد

Gurugnanam,B. (2009). Essentials of hydrogeology. New India Publishing Agency.

استشهاد بنمط شيكاغو

Gurugnanam,B. Essentials of Hydrogeology. New Delhi: New India Publishing Agency, 2009.

MLA استشهاد

Gurugnanam,B. Essentials of Hydrogeology. New India Publishing Agency, 2009.