APA-čujuhus (7. p.)
De, A. K., & De, A. K. (2001). Environmental studies. New Age International.
Chicago-čujuhus (17. p.)
De, Anil Kumar, juo Arnab Kumar De. Environmental Studies. Calcutta: New Age International, 2001.
MLA-čujuhus (9. p.)
De, Anil Kumar, juo Arnab Kumar De. Environmental Studies. New Age International, 2001.
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