A. K. Singh. (2006). Environment and water resource management. Adhyayan.
Chicago Style aipamenaA. K. Singh. Environment and Water Resource Management. Delhi: Adhyayan, 2006.
MLA aipamenaA. K. Singh. Environment and Water Resource Management. Adhyayan, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.