Poonia M.P. & Sharma S.C. (2023). Environmental Studies (03rd.). Khanna Publications.
Chicago-čujuhus (17. p.)Poonia M.P. & Sharma S.C. Environmental Studies. 03rd. New Delhi: Khanna Publications, 2023.
MLA-čujuhus (9. p.)Poonia M.P. & Sharma S.C. Environmental Studies. 03rd. Khanna Publications, 2023.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.