Gupta, S. (1992). Black income in India. Sage.
Lua i Stíl Chicago (17ú heag.)Gupta, Suraj. Black Income in India. New Delhi: Sage, 1992.
Lua MLA (9ú heag.)Gupta, Suraj. Black Income in India. Sage, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.