Sawhney,g.s. (2012). Non-conventional energy resources. PHI learning pvt.
Chicago-čujuhus (17. p.)Sawhney,g.s. Non-conventional Energy Resources. Delhi: PHI learning pvt, 2012.
MLA-čujuhus (9. p.)Sawhney,g.s. Non-conventional Energy Resources. PHI learning pvt, 2012.
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