APA-čujuhus (7. p.)
Poonia, M., & Sharma, S. (2017). Environmental studies. Khanna Book Publishing Co.
Chicago-čujuhus (17. p.)
Poonia, M.P, juo S.C Sharma. Environmental Studies. New Delhi: Khanna Book Publishing Co, 2017.
MLA-čujuhus (9. p.)
Poonia, M.P, juo S.C Sharma. Environmental Studies. Khanna Book Publishing Co, 2017.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.