APA
Viegas P., Menon G., . (1989). The impact of environmental degradation on people. New Delhi: Indian Social Institute (ISI).
Chicago
Viegas P, Menon G, . 1989. The impact of environmental degradation on people. New Delhi: Indian Social Institute (ISI).
Harvard
Viegas P., Menon G., . (1989). The impact of environmental degradation on people. New Delhi: Indian Social Institute (ISI).
MLA
Viegas P, Menon G, . The impact of environmental degradation on people. New Delhi: Indian Social Institute (ISI). 1989.