Singh, R. B. (1998). Ecological techniques and approaches to vulnerable environment: Hydrosphere-geosphere interaction. Oxford & IBH Publishing Co..
Lua i Stíl Chicago (17ú heag.)Singh, R. B. Ecological Techniques and Approaches to Vulnerable Environment: Hydrosphere-geosphere Interaction. New Delhi: Oxford & IBH Publishing Co., 1998.
Lua MLA (9ú heag.)Singh, R. B. Ecological Techniques and Approaches to Vulnerable Environment: Hydrosphere-geosphere Interaction. Oxford & IBH Publishing Co., 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.