Tyagi, A., & Singh, V. (2014). Trueman's specific series UGC NET/SET environmental science: Environmental Science. Danika.
Παραπομπή Chicago StyleTyagi, Anil, και Virendra Singh. Trueman's Specific Series UGC NET/SET Environmental Science: Environmental Science. New Delhi: Danika, 2014.
Παραπομπή MLATyagi, Anil, και Virendra Singh. Trueman's Specific Series UGC NET/SET Environmental Science: Environmental Science. Danika, 2014.
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